Quote:
Originally Posted by Vwbeamer
2000 rrpm is just a rule of thumb. The rpm for best economy could vary a lot depending on engine design.
My car gets it's best at ~1600 rpm,
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Not just engine design. Toss the same engine in a heavier car (or add three over weight adult passengers - say 250lbs each - to the current car) and the most efficient rpm will be significantly greater than 1600 rpm.