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Manual? Auto? Gear? Speed?
Your mileage is going to suck if you try to drive on the freeway in 1st gear only.
For optimum mileage, just park at the top of a hill. Turn off the engine. Put the car in neutral and let off the brakes. You'll get over a million miles per gallon at 0 RPM for as long as the downhill ride lasts.
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