Driving at a constant moderate speed is the way to go, and if your vehicle has a tachometer (the needle that measures your engine rpm’s)do not allow it to go above 1900-2000 rpm’s when starting from a dead stop. You use less fuel at a slower accelleration then if you do a jack-rabbit start. You can get up to 60 mph at 2000 rpm’s. If you live in a hilly area, this is a little more dificult to do, but you can also shift into neutral when going down big hills. The tach will drop as low as 1000 rpm’s saving more fuel. I got an increase of over 10% in mpg on a tank of gas in Pittsburgh, PA. (Hills, Mountains, and more Hills)
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