Quote:
Originally Posted by aerohead
the larger engine would shrug off the acceleration ,operate at partial load,lower friction.
*the smaller engine would labor under acceleration,operate at a higher load fraction,higher rpm,higher internal friction.
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I can't agree with this. The dynamic compression ratio DCR is highest at wide open throttle WOT, so that's when any given engine is getting the most energy from every drop of fuel. This is even more so at the RPM at which torque peaks at WOT, but then you'd need a microscopic engine to cruise at WOT at peak TQ without it making excess torque, then you'd have to run it at that road speed all the time, use nitrous for passing.
As for greater friction at WOT, this really isn't so if the oiling system has excellent design and is working as designed.
However, the slower the rate of acceleration, the less fuel used. Think how one man can get a car up to 5 MPH gradually, but you'd need 6 Clydesdale horses to do it quickly.