And, one that makes alot of sense when you consider the cost/benefits:
in a family sedan, every 10 mph you drive over 60 is like paying 54 cents per gallon more for gas you bought at $3.25 a gallon. That extra cost is even higher if you're buying more expensive gas, and for big SUVs and other less-efficient vehiclesSo, if you're looking for cheaper gas, it appears that your own gas pedal is an efficient place to start.
And the time you save by going easy on the accelerator may not add up to as much as you thought. On a 300-mile trip, driving 65 instead of 70 mph would cost you only 20 minutes -- but save money and spew less carbon.