2,000 RPMs just means the engine is turning at a rate of 2,000 revolutions per minute. The speed at which this would carry a vehicle is determined by the final drive gear ratio of the differential. A vehicle with a final drive ratio of 3.85 to 1 would not be moving as fast as one with a ratio of 2.85 to 1. It would take 3.85 revolutions on the engine to turn the drive wheels over 1 time on the 1st vehicle and only 2.85 on the second. So naturally the second vehicle would be traveling faster at 2,000 RPMs.
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