Ze-Jamz, and David, you can still comapare it to driving a car, think like this, you are cruising in your car at 100kph in 5th gear at 2000rpm, you want to overtake someone you can just stamp on the gas and wait for the engine to get higher in the rev range where it makes most power, or you can downshift to 4th, which will put the engine Into it's powerband so to speak and accelerate quicker, eventually you will still have to change back into 5th but you will be going faster at this stage and the engine will already be near it's peak. Most engine types develop their peak at around 2/3- 3/4 of their max revs.
Craig
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