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RPM stands for "revolutions per minute", and are the amount of complete revolutions (360 degrees) a crankshaft spins in one minute. Also, it gives you an idea of how much work your engine is doing. The red line indicator on your tachometer, is an indication of very high RPM's, and should be avoided if possible. Generally your car cruises along the lines of 3,000 rpm. More than that, and you should probably go to a higher gear.
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