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Old 12-04-2007, 05:30 PM   #2 (permalink)
Depends on the Day
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Theoretically, but I recall a discussion that an engine has an ideal "piston speed" of 1350 ft/min (total travel) for the best Economy. I know in my 1.8L, constant load at 1500 RPM is less efficient than the 1800-1900 RPM, which is closer to the 1350 speed mark...

More testing/research may be required


Originally Posted by MetroMPG View Post
the best cruising efficiency is achieved in top gear at the the lowest RPM. (Level road, constant speed, no other traffic creating aerodynamic effects.)
“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein

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