What Octane Do You Prefer?

[2oodoor]

100 Low lead

Low lead and no nox gulf
ol skool tawkin right there..


In my truck it gets average of 2 mpg on 93 than 87 but the quality of the gas itself is the key because sometimes the 87 lasts sometimes it goes way too quick.

I usually use 93 in the B20 just because it smells better when it's evaporating from the Weberand I can run the ignition timing a wee higher for less throttle opening for DD.

[DBMaster]

^What you are saying right here only reinforces my position. More volatile gasolines that did not exist back when all cars had carbs do cause more evaporative loss right out of the fuel bowl. Also, if you change timing, any fuel economy changes cannot be attributed to the gasoline alone. Remember, controlled conditions and instrumentation. Without it a difference of 2 mpg is not significant.

[AccordEpicenter]

where is the C12 option?

[DBMaster]

I wonder, also, how significant the differences are in batches of blended gasoline. We all know that there are differences between "summer" and "winter" gas, or at least there used to be. The stuff in the summer was less volatile to reduce evaporative emissions and vapor lock (like anyone gets that anymore). I'll bet good money that fuel economy changes with a change in the ambient temperature/fuel blend combination. I've opened up my own can of worms.

It's like oil. Whichever one makes you feel better is worth the money. This is in the "sticker adds 10 HP" domain. LOL.

[lostforawhile]

I wonder, also, how significant the differences are in batches of blended gasoline. We all know that there are differences between "summer" and "winter" gas, or at least there used to be. The stuff in the summer was less volatile to reduce evaporative emissions and vapor lock (like anyone gets that anymore). I'll bet good money that fuel economy changes with a change in the ambient temperature/fuel blend combination. I've opened up my own can of worms.

It's like oil. Whichever one makes you feel better is worth the money. This is in the "sticker adds 10 HP" domain. LOL.

big difference between the oil and gas, corn gas doesn't chew up your rockers, need to stick with the oils with zinc or add the zinc, thats pretty much a given since it was taken out, the only engines where you don't have to worry about it are those with roller rockers

[DBMaster]

^That's why I ended up with Rotella T Syn 5W-40 as my oil of choice for the last several years I had the car (diesel engine oils have more zinc). The new car has roller rockers and the oil is 0W-20 syn. It's a really low friction engine, by design.