best rpm range

[Warren 88 Accord]

at what rpm range would be best for economy in a 88 accord lxi with an a20a3 5 speed ??

[charliekuney]

Under 3k, which means you can't go over 60-70mph on the freeway. I think 3k is the point where you start losing mpg's.

[Tdurr]

lol im at like 27-80 at 3k in 5th...
but yea keep it under 3k and ur good, also thats where the tq is at in our cars

[charliekuney]

lol im at like 27-80 at 3k in 5th...

27-80? That's a huge range, Mr. Tdurr. ;)

[Warren 88 Accord]

thank you guys i been goin 75 and its at about 3200-3300 will that still bring accptable mpgs? and anything above 25mpg is amazing for me i used too have a gas guzzling truck that got 18mpg if i was lucky and kept a light foot

[charliekuney]

At 72mph I'm at 3,000rpm and consistently get damn close to 50mpg on the freeway. In the city I drive hard and currently in the snow bottom out at 25mpg. I average 35mpg in the city. All of this is on 87-octane gasoline from SafeWay.

[Oldblueaccord]

I drove 300 miles in 3 hours with a quick gas/water stop an got 30mpg. I was on vacation in Montana.

Best thing is not to lug down the motor. Going 20 mph in 5th gear and trying to accelerate is going to make the car run way rich. Shifting at or over 3k rpms seems best.


wp

[cubert]

at 72mph i'm at 3,000rpm and consistently get damn close to 50mpg on the freeway.


:kekeke:

[charliekuney]

What, you don't believe me? I've kept receipts and actually done the calculations.

edit: approximately 800 miles / 15.9 gallon tank = 50.3144654 miles per gallon, no?

[MessyHonda]

What, you don't believe me? I've kept receipts and actually done the calculations.

edit: approximately 800 miles / 15.9 gallon tank = 50.3144654 miles per gallon, no?

so this mean you absolute empty the tank till its dry?

[Nafs Asdf]

At 72mph I'm at 3,000rpm and consistently get damn close to 50mpg on the freeway. In the city I drive hard and currently in the snow bottom out at 25mpg. I average 35mpg in the city. All of this is on 87-octane gasoline from SafeWay.

Speedo showing 72 mph, doesn't actually mean you are travelling at 72 mph.

[cubert]

What, you don't believe me?

nope.

[Dr_Snooz]

No way you got 800 miles from a tank. No way. You left out a gas stop.

[Tdurr]

Lol bouncing speedo sooo idk the exact speed....

Also I call bs on 50mpg

[charliekuney]

so this mean you absolute empty the tank till its dry?

No, but 400 miles to half a tank, doubled.


Speedo showing 72 mph, doesn't actually mean you are travelling at 72 mph.

Ooooooooh, so I'm really going 71mph?


nope.

cool


No way you got 800 miles from a tank. No way. You left out a gas stop.

nope


Lol bouncing speedo sooo idk the exact speed....

Also I call bs on 50mpg

My speedometer doesn't bounce. If I can find a way to prove it to you guys, I will. Otherwise, think what you must, and be jealous. :wave:

edit: I'm thinking of ways to prove your guys wrong or prove myself wrong. I'll docutment when I fill up, how much I put in, and how far I drive until the gas light won't turn off and my car is hard to start.

[Nafs Asdf]

Ooooooooh, so I'm really going 71mph?

Probably closer to 65, if even that.

[car6289]

Be careful Charlie. With that kind of fuel economy, BIG oil companies may find you and make you disappear.:nervous:

[charliekuney]

Probably closer to 65, if even that.

Well, you're tempting me to rent a radar gun.


Be careful Charlie. With that kind of fuel economy, BIG oil companies may find you and make you disappear.:nervous:

We'll see, haha.

---

Sorry for the complete thread jack, OP. I'll start a new one eventually...

[Nafs Asdf]

Well, you're tempting me to rent a radar gun.


If you know your gear ratios and tire size, you could calculate your real speed.

[A18A]

No, but 400 miles to half a tank, doubled.

If you're reading that 'half a tank' from the fuel gauge, that is terribly inaccurate.

[AccordB20A]

i second that^^^^

my accord got 450km from full to half and then 220km till empty once all open highway driving

[ShyBoyCA6]

I find this BS that you get 800miles for a full tank. Most might be 600 miles if not less.

[Dr_Snooz]

If you know your gear ratios and tire size, you could calculate your real speed.

Or just find one of those radar signs that shows your speed.

The proper way to calculate your fuel economy is to note your mileage at each gas stop. At every gas stop, top off the tank. The gas pump will show you how many gallons just went in your tank, so you subtract your current mileage from your mileage the last time you topped off the tank and divide by the number of gallons showing on the pump.

(current miles - miles at last fill up)/(number of gallons showing on the pump)

I built a small spreadsheet that I keep on my phone. Every time I fill up, I note the miles and the gallons. I think there's an iPhone app that does something similar. When I get home, I'll post it up for others to use. I use it to track gas mileage, repairs, the maintenance schedule and other details that I need to keep track of. It's quite a good spreadsheet.

I suspect with an LX-i, you'll find that your mileage is much closer to 30 mpg than 50. Sorry to burst your bubble.

[Ayeobe]

Damn guys ... my fuel economy sucks =/ Should it still be like 25-30mpg in an EX-i (LX-i) Automatic? *typed manual by accident :violin:)

Cos im getting like 11.5L/100km... which translates into about 20.5mpg aparently. This would be half-half i guess, calculated on like a week and a half of driving.

[charliekuney]

Sorry to burst your bubble.

No bubble bursted, but I'm going to create a spreadsheet and see what happens.

[MessyHonda]

If you're reading that 'half a tank' from the fuel gauge, that is terribly inaccurate.

yeah unless you have a digital guage or a inacurate gas pump trying to rip you off a 3gee accord does not get 800 miles to the gal...or you must be running really lean that is bad for the engine and burn a valve

[AccordB20A]

even the digital gauge isnt accurate, nothing mechanical really is

[soonerck]

Damn guys ... my fuel economy sucks =/ Should it still be like 25-30mpg in an EX-i (LX-i) Automatic? *typed manual by accident :violin:)

Cos im getting like 11.5L/100km... which translates into about 20.5mpg aparently. This would be half-half i guess, calculated on like a week and a half of driving.

I just ran my first full tank of gas through and I'm getting the exact same mileage! 20.5 miles to the gallon?!!! Something got to be off here somewhere. I'm starting the mileage chasing with a can of BG 44k. Then on to plugs, wires and rotor. What should I do following that? Any suggestions for us awful mileagers?

p.s., tires are new and properly inflated.

[RAZR]

Damn guys ... my fuel economy sucks =/ Should it still be like 25-30mpg in an EX-i (LX-i) Automatic? *typed manual by accident :violin:)

Cos im getting like 11.5L/100km... which translates into about 20.5mpg aparently. This would be half-half i guess, calculated on like a week and a half of driving.

there must be something wrong cause i dont drive conservativly i usually shift at about 5k and barely use 5th gear and i even get 26 in the winter

i got 20 miles to the gallon once and that was only cause i killed my battery so i left it running for 2 hrs and i drag raced two of my friends up to about 115

[1813mdw]

I just ran my first full tank of gas through and I'm getting the exact same mileage! 20.5 miles to the gallon?!!! Something got to be off here somewhere. I'm starting the mileage chasing with a can of BG 44k. Then on to plugs, wires and rotor. What should I do following that? Any suggestions for us awful mileagers?

p.s., tires are new and properly inflated.

new air filter or a cai. seafoam the engine through a vacuum line also i run my tires about 5lbs over what their rated at. all the little things add up.

[frantik]

even the digital gauge isnt accurate, nothing mechanical really is

mythbusters add a second gas tank and weigh the tank before and after to get an accurate consumption amount.. everything else is just a guess lol

[Vanilla Sky]

Back to the topic.

The best revs for the motor isn't always going to be the same. It depends on the load on the engine, not how fast it's spinning. We don't have super sophisticated engine controls, so you're not going to get an uber lean burn like you can with modern engine controls.

If you really want to drive as efficiently as possible, get a vacuum gauge.

[A18A]

mythbusters add a second gas tank and weigh the tank before and after to get an accurate consumption amount.. everything else is just a guess lol

that is a good idea. I was gonna get a bottle and fill it with 1 litre of fuel and run my car off that (see how far I get) but I coudln't be bothered lol

[g.frost]

At 72mph I'm at 3,000rpm and ......

That sounds like my '88 DX 5 speed; 3000rpm does 75mph in 5th. (speedometer and odometer verified)

My best gas mileage ever (had the car since new) was 38-39 mpg, over 500 miles on a single tank. Drive was all on secondary highway where I could not exceed 65mph, mostly 55-60 but there were hills and curves and acceleration for passing big rigs, etc. I'm sure it could break 40mpg if on a flat, steady speed, egg under the shoe and keeping under 65mph. (never could manage to do that though) My normal 75+mph highway driving gets 34-35mpg out of the old carb.

I think wind speed/air drag will lower mpg for high speeds quicker than engine rpm.

[2ndGenGuy]

That sounds like my '88 DX 5 speed; 3000rpm does 75mph in 5th. (speedometer and odometer verified)

My best gas mileage ever (had the car since new) was 38-39 mpg, over 500 miles on a single tank. Drive was all on secondary highway where I could not exceed 65mph, mostly 55-60 but there were hills and curves and acceleration for passing big rigs, etc. I'm sure it could break 40mpg if on a flat, steady speed, egg under the shoe and keeping under 65mph. (never could manage to do that though) My normal 75+mph highway driving gets 34-35mpg out of the old carb.

I think wind speed/air drag will lower mpg for high speeds quicker than engine rpm.

The car was rated at like 28MPG highway... What methods are you using to measure your gas mileage? I can see getting a few MPG over the rated, but a carb'd A20 Accord getting D16 Civic fuel economy?

Also, WTF Charlie? You are NOT getting anywhere near 50mpg. You'll be lucky to see 29 with the way you drive.

[g.frost]

The car was rated at like 28MPG highway... What methods are you using to measure your gas mileage? I can see getting a few MPG over the rated, but a carb'd A20 Accord getting D16 Civic fuel economy?

.........

EPA ratings mean little to me. I have found them to be only a rough guide. I've had the car since new and simply divide the elapse miles by the amount to fill up. Yeah there is variance depending on the pump cut off but this averages out over a few fills anyway.

Winter around town I get 26mpg, 32 on the highway. Summer gas (and no flaky choke to waste gas) is 28 around town and 34-35 on the highway. It has always been this way. I routinely run it 65-75mph on the hiway, no A/C on the DX either.

Our 2005 Civic LX sedan gets 30mpg around town, 38-39mpg on the hiway in same driving conditions ....never able to get over 40mpg with it. A/C or not.
the 2005 weighs the same as my 88 DX; about 2600 lbs.

[charliekuney]

Also, WTF Charlie? You are NOT getting anywhere near 50mpg. You'll be lucky to see 29 with the way you drive.

I don't drive like that all the time! And I want to clear up an earlier post: I did not mean to say I was getting 50mpg at 3,000rpm going 72mph. I was going 55 when I got 400 miles out of "half" a tank, "according to" my gas gauge.

[g.frost]

....... I was going 55 when I got 400 miles out of "half" a tank, "according to" my gas gauge.

On every Honda I've owned, the 'first half' of the tank is much bigger than the 'second half'. Not a reliable measure for actual gas mileage.

It does seem these higher geared MT's get better gas mileage at highway speed. But I wish first gear was lower when plowing out of 6 inches of snow.

[-DWM-]

g.frost, where do you live?

He may be talking about Imperial Gallons, which is larger than a US gallon.

[snoopyloopy]

i've been getting around 29-32 consistently. most is 34.6 a few weeks ago. but my averages have gone up over the last year or so due to engine not functioning at full potential. headgasket is suspected, a fix is in the works. however, new engine will have cam, so i'm not expecting low-30s for long cruise once that happens...

[charliekuney]

My gas mileage definitely sucks, by the way.

:wave:

[YK86]

Whenever I measure my mpg/fuel economy, I always start by filling up the tank and resetting my trip odometer to 0. Next time I fill up, regardless of if I fill up when the gauge says half or empty, I just divide the miles driven with the gallons I filled up.

If I had gone by the gauge only on my current 3rd gen, it would have meant I got 40mpg the first half tank and 18mpg the last half lol.

[Lil Mike]

holy crap i wish i could even get 20mpg, the car i drive now is just rotten on gas, i get 11mpg and about 13-14mpg highway. dont buy a j30!!!

[2oodoor]

Charlie?
50 mpg? no you cant double your mpg by saying you got 400 miles out of a half tank, it just doesn't work like that! There is varience with the sender float geometry, also with resistence to ground. If your theory applied then Im getting 29 mpg with my full size F-150 V8 since I get 353 miles at half tank on the guage. Nope, not happening, more like 18 since im getting 430 out of a full tank...24 gal tank.
Most any vehicle out there will read similar, either runs to a half quickly or the opposite. Not all but most.

Ive noticed with my car, B20 with weber 38 carb, that just under 3000 rpm it still runs off the idle jets at cruise speed. Ive noticed a huge difference in mpg by keeping it under 3000 which on my car running stock 13 inch on the front this past month is around 63 mph. None of this is precise since the speedo is off because im using JDM hardware for a USDM speedometer.
Close though.
MY point here is evidently there is more of a vaccum dip right at that 3k mark, stock cam(s) that means less MPG.
Also you can cross reference your speedometer accuracy by using a GPS, multiple GPS formats as well such as ipod or cellphone plus garmin or what have you....I actually haven't done that on this car yet though.

OP you can install a vacuum guage inside the car to help you hypermile, keep the vacuum numbers high as possible.

[gp02a0083]

as roodoo said keep the rpm's below 3k.

I've noticed with all 3 of my hatches that keeping them under 3k on the highway will yield better gas mileage.

i noticed a little bit of pickup on my 87 hatch when i went from the stock 13" rims/tire to the 14" sei's with a slightly larger tire. I did this to bring the rpm's down a little.
i get around 30-35 mpg with my current hatch running on 92 octane. my 87 at best was getting 29-32. My first hatch i could easily get 360-370 miles out of a tank.

I know at least on the 88-89 intakes you have the secondaries open up after 3k


trick is for best fuel economy , up the pressure in the tires a bit, use slightly larger tires, keep the weight down, as others have said keep the rpm's under 3k. On the highway i tend to stick with tractor trailers just far enough to be safe.

[snoopyloopy]

as roodoo said keep the rpm's below 3k.

I've noticed with all 3 of my hatches that keeping them under 3k on the highway will yield better gas mileage.

i noticed a little bit of pickup on my 87 hatch when i went from the stock 13" rims/tire to the 14" sei's with a slightly larger tire. I did this to bring the rpm's down a little.
i get around 30-35 mpg with my current hatch running on 92 octane. my 87 at best was getting 29-32. My first hatch i could easily get 360-370 miles out of a tank.

I know at least on the 88-89 intakes you have the secondaries open up after 3k


trick is for best fuel economy , up the pressure in the tires a bit, use slightly larger tires, keep the weight down, as others have said keep the rpm's under 3k. On the highway i tend to stick with tractor trailers just far enough to be safe.
interesting that you get better mileage with wider tires. usually, the reverse is true. look at many hybrids or even econoboxes and they all have skinnier than average tires to reduce rolling resistance (and frontal cross-section).

[charliekuney]

It also takes less power (gas) to move smaller wheels, does it not?

[RAZR]

It also takes less power (gas) to move smaller wheels, does it not?

i was always under the assumption that
smaller wheels=faster car but less gas mileage

[1813mdw]

i was always under the assumption that
smaller wheels=faster car but less gas mileage


the car will excelerate "faster" but you will not change your top speed really with smaller wheels and tires. everything is a compromise between drivability in stop and go traffic and keeping the rpms down on the highway. if you only drove on the highway you could run huge diameter and super skinny wheels/tires and get great great mpgs once you eventually got up to speed. i think the best way would be to find a happy median w/ wheels/tires(like factory) and change gearing in the trans to fit your type of driving. not alot is available as bolt in for us so it would need to be custom and very pricey

[snoopyloopy]

wait wait wait. are we talking smaller as in radius or smaller as in depth? all else being equal, if someone moves from 155s to 225s on their car, their mileage will probably drop a noticeable amount. that's why priuses, insights (both old and new), and even geo metros have those wheels that almost look like bike tires. however, if we're talking about radius (2r = d), then yes, bigger is better--to a point. i really don't feel like doing any math/physics right now. but suffice it to say that an engine turning at 2500 connected to 13" wheels will not allow you travel as far as you could if it were connected to 18" wheels. of course, the point of too large is where the added mass of the wheel requires more power to turn than is available from the engine. setting the equation governing how the speed relates to size equal to the equation concerning how mass relates to power will allow for calculation of the size/weight combo that yields optimum economy compared to power.

[MessyHonda]

you guys are right the wider the tire the more HP it will take to push it

[A18A]

pacefalm

[Hauntd ca3]

Charlie?


Ive noticed with my car, B20 with weber 38 carb, that just under 3000 rpm it still runs off the idle jets at cruise speed. Ive noticed a huge difference in mpg by keeping it under 3000 which on my car running stock 13 inch on the front this past month is around 63 mph.

i found with my b20a that i got better mileage pulling about 3300rpm on the highway.
thats just the auto to manual conversion changing the top gear ratio.
my cd6 got better mileage at 3500rpm than at 3000rpm.
and before you say its because the auto sux heaps of power, i tried the manual at 3k and the mileage was the same as the auto.
i found at or below 3000 revs in the b20a, it was labouring at 100kmh but just the extra 300 revs stopped it from doing so.
i picked up prob 5mpg just with the extra few revs.

[charliekuney]

I've still been monitoring this. So, I'm a delivery driver. That should say enough about my city gas mileage. I work for Jimmy John's. If you don't know what that is, Google it, and you'll figure out why it's even worse. I average 20-25mpg city while delivering, but driving around normally with mixed city/highway I still get 600 miles out of a tank without a problem.

[2drSE-i]

I've still been monitoring this. So, I'm a delivery driver. That should say enough about my city gas mileage. I work for Jimmy John's. If you don't know what that is, Google it, and you'll figure out why it's even worse. I average 20-25mpg city while delivering, but driving around normally with mixed city/highway I still get 600 miles out of a tank without a problem.


Unless your doing 55 mph, shifting at 1500 and drive with your pinky toe i'm calling bullshit. I can see that kind of mileage highway only with a very well maintained car, but mixed driving, no way.

[ShyBoyCA6]

Well I got 32-34mpg driving in the city under 2.5k and 38-40mpg on the highway below 3k. Believe it or not did the math right and tires are at specs rolling on 14's. So I'm getting 480 or 510 average on a full tank with city and highway driving.

[MessyHonda]

max i ever got was 420 but i had my fat 5s on it

[ShyBoyCA6]

420

Just Around the Corner lol PUff And Pass MAn lol

[MessyHonda]

fatty five sacks

[Tdurr]

Just Around the Corner lol PUff And Pass MAn lol


fatty five sacks

i like u guys style.

[charliekuney]

Unless your doing 55 mph, shifting at 1500 and drive with your pinky toe i'm calling bullshit. I can see that kind of mileage highway only with a very well maintained car, but mixed driving, no way.

You're one person on a forum where probably less than 1,000 people visit remotely regularly. I could care less if you think I'm bullshitting.

Also; yes, I don't exceed 55mph. I don't shift higher than 2,500rpm (usually). I take two blocks to get to 25mph (standard speed limit around here). I'm sorry that most people on here drive really shitty and get horrible gas mileage, but that doesn't mean the 1,000,000+ people in the world who had cars like these can't.

[A18A]

Unless your doing 55 mph, shifting at 1500 and drive with your pinky toe i'm calling bullshit. I can see that kind of mileage highway only with a very well maintained car, but mixed driving, no way.

maybe it was 300 miles from the full mark to the half way mark on the gauges, doubled :P

[ShyBoyCA6]

i see someone getting ass hurt in hur lol:D

[mushroom_toy]

Yeah I call bs too lol. The most I get is normally around 430 miles per tank...and thats driving very carefully and precisely usually from an almost dry fillup. Last year got 380 to the tank pulling my motorcycle behind the car on the trailer uphill from fl. to ga on the highway, not pulling anything usually get 400-435ish.

Also my car is leaned out almost to the max using my piggyback...so I know theres no way anyone is getting over 460 miles to the tank, especially with how shitty the gasoline mix is. Non-ethanol fuels last a LOT longer but are getting harder and harder to find. Most I have found is usually up in Tenn.

Also I usually overinflate my tires...usually 40-43psi, and remove everything possible from the car. I never bring a spare or anything like that, have no rear seat, sound deadening, no ac, no ps, etc. etc.

[2drSE-i]

You're one person on a forum where probably less than 1,000 people visit remotely regularly. I could care less if you think I'm bullshitting.

Also; yes, I don't exceed 55mph. I don't shift higher than 2,500rpm (usually). I take two blocks to get to 25mph (standard speed limit around here). I'm sorry that most people on here drive really shitty and get horrible gas mileage, but that doesn't mean the 1,000,000+ people in the world who had cars like these can't.

Haha yea, come up with a good reason to visit oklahoma and we'll kick it, but even I can't come up with one so what's that tell ya? Its a great place to live, but our tourism sucks.

[cubert]

You're one person on a forum where probably less than 1,000 people visit remotely regularly. I could care less if you think I'm bullshitting.

Also; yes, I don't exceed 55mph. I don't shift higher than 2,500rpm (usually). I take two blocks to get to 25mph (standard speed limit around here). I'm sorry that most people on here drive really shitty and get horrible gas mileage, but that doesn't mean the 1,000,000+ people in the world who had cars like these can't.


So not only do you not get the gas mileage you are claiming...but you also drive like a total ass while doing it?

[charliekuney]

So, not only do you not comprehend what I said...but you also reply and make it obvious? -_-

It's whatever. I could care less if people believe me or not. It's just a forum.

[MessyHonda]

So, not only do you not comprehend what I said...but you also reply and make it obvious? -_-

It's whatever. I could care less if people believe me or not. It's just a forum.

you down to drive me around?


well i honestly dont believe you till i see it by myself

[charliekuney]

I'm going to kidnap 2ndGenGuy for a day since he's the closest member [I assume] you would all believe in a heartbeat.

[cubert]

You could kidnap whoever you want...i am still not going to believe youre getting 800, or 600, or whatever the next mileage figure you're going to claim next, to a tank of gas.


No need to get all pissy because people aren't believing your outlandish claims.

[ShyBoyCA6]

I agree with cubert

[Tdurr]

lol maybe his tank is extra large.... or 2 of his injectors are clogged..

i get 30mph on the hwy and that made to like 350-400ish on a FULL tank till the light came on steadily(no flicking on and off going up/down hills.)

[ShyBoyCA6]

well i filled up my tank and reseted the tripometer if thats what you call it. so far i have 88 or 90 miles on it since i filled up. i will post from every quarter i go to see how many miles i get and per full tank :).

[charliekuney]

You could kidnap whoever you want...i am still not going to believe youre getting 800, or 600, or whatever the next mileage figure you're going to claim next, to a tank of gas.

No need to get all pissy because people aren't believing your outlandish claims.

I would say I could care less, but I don't think that is possible at this point. How about I just agree with all of you so everyone can shut the fuck up and be happy? Good. End of conversation. 1 everyone, 0 Charlie.

[ShyBoyCA6]

Yay :D we won the battle lol

[Warren 88 Accord]

woohoo threadjack and stop :deadhorse: is over now thank you for all your help im sitting at 29- 30ing rpms and mpg i took two tanks of gas trying different driving styles and 2900 is the best rpm for my LX-i

[Dr_Snooz]

2900 is the best rpm for my LX-i

Seriously? I would expect that your peak MPGs would be somewhere around 55 mph. At 2900, you're closer to 75.

[Ichiban]

Doing the math the average hwy mileage I got in the 2g with the 1.6 carby and lead foot was 29.6 MPG. I'm converting this from a 756 KM trip that I could do on exactly one 60 litre tank. Over and over again, I'd pull in on fumes. Nothing really spectacular here, other than I'm willing to claim worse mileage than most.:violin:

Oh, and my RPM was usually somewhere between 3 and 4.5K.

[Demon1024]

having short ram,cat back, slightly advanced ign timing,valvles adj and T-belt tension adjusted properly can make a huge difference in mpg.From 25-35 average mpg

All flat road 42 mpg average on trip. calculated from full both ways. 40 down and 44 going back up. On 15' alloys (get cheap from saturns) 65 mph hiway

[Tread]

If you're reading that 'half a tank' from the fuel gauge, that is terribly inaccurate.

THANK YOU:banghead:

[charliekuney]

Leave it to Tread to bring up a thread from the dead.

Also, if anyone is wondering...I've been averaging 320 miles out of a tank - from fill up to the gas light "staying on steadily". I have gotten one 517 mile tank, but that was mostly highway staying under 55mph. I have fully realized how 'outlandish' 600-800 mile tanks are out of these cars. I've also realized it's practically impossibly to put more than 14 gallons of gas into the 15.9 gallon tank.