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go on the highway or something and drive normally, time how long it takes to use 1/4 of a tank, then go back to where you started and use cruise, it might be expensive but no pain no gain
It would depend on the car, probably. I wouldn't trust most cars.
Wrong. Lower gear = higher RPMs and more gas consumption. You're actually using more gas. It is, however, easier on your brakes. Right now gas > brakes.
Ah, brakes was probably what I was thinking of. Thanks for saving me some frustration...