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Old 12-04-2007, 05:30 PM   #2 (permalink)
RH77
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Join Date: Nov 2007
Location: Kansas City Area
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Teggy - '98 Acura Integra LS
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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

RH77

Quote:
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.)
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