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Old 05-19-2020, 05:14 AM   #47 (permalink)
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GreenTDI - '11 Skoda Fabia Estate R3 1.2 CRTDI
90 day: 65.02 mpg (US)
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Originally Posted by EcoCivic View Post
I hear all the time that engines run most efficiently at the RPM they make peak torque at, but if that was the case I would be most efficient at 5K+ RPMs. Or maybe that is only true at full throttle on gasoline engines?
The most efficient power boost, probably. Not for the best fuel efficiency. That should be at the point where the engine delivers a comfortable amount of power for the speed driven. At legal speeds, that is mostly at lower rpm's with both diesel and petrol engines.

For my diesel it is between 1600 - 1900 rpm. Maximum torque at 2200 rpm.
Skoda Fabia Estate R3 1.2 CRTDI
See my thread:
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