My A/C temperature varies somewhat depending on the speed of my car/ engine. I find this rather annoying, since at my typical cruising speed, 80 mph, (~3250 rpm), my A/C is no longer cold, just cool. When I take the car out of gear to take an offramp, etc, the A/C begins to get cold again, and stays that way as long as the engine is at or under 3000 rpm. Interestingly enough, if I decide to cruise at a higher speed, like 90 mph, the A/C gets cold again, although this really hurts my mpg...WTF?? My theory is that the A/C compressor is not as efficient at higher rpm, and I think that an underdrive pulley would solve this, as well as slightly improving my mpg/power with the A/C on. Have any of you guys experienced this or tried underdrive pulleys with the A/C?