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Old 04-05-2020, 01:54 PM   #18 (permalink)
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Originally Posted by MeteorGray View Post
I have always figured that after achieving high gear in any car, the lowest RPM value will yield the highest fuel economy.
That's probably true with fixed gearing, because load is *probably* more important than piston speed in the vast majority of cases.

But, let's say you have a hybrid vehicle, which can spin the engine at whatever RPM, and toggle it on and off whenever. Is it going to be more efficient to spin the engine at, say, 3000rpm 90% load for 30 seconds out of every minute, or to spin it at 1500rpm 90% load and leave it running all the time?
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