Quote:
Originally Posted by DifferentPointofView
If your driving a car, but some cars with larger engines A/C is better than open windows, because the A/C doesn't hit as bad as the drag coefficient hit from open windows.
Trucks, vans and SUV's take the hit real bad from open windows at 55, even at 40. I usually close the windows after I hit 35 and turn on the fan (no A/C). Even from winds blowing the vehicle backwards makes it harder to keep speed, making your vehicle a giant parachute isn't any better.
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Do any of you have a source for this AC data or is just accepted practice?