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
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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