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Originally Posted by rookie
I would like to see more here about gear and overdrive transmissions effects on economy as well.
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I think gear ratio have great role in fuel economy, because it's making just same thing = Improving cylinder pressure. If you put your vehicle in higher gear, what you are actually doing, you lower engine rpm and you increase compression pressure, because you have to push more gas pedal to get satisfying torque from engine. But engine have it's limits for low rpm operation, especially if it is made for high rpm performance.