Quote:
Originally Posted by sword_guy8
What I discovered was NOT peak FE based on engine RPM. In fact, engine RPM has nothing to do with it. The only thing I've found which has a direct correlation to FE is manifold pressure.
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This is really simple if you think about what you're actually measuring.
At a constant load/MAP, as speed rises, so does RPM, and this means your fuel usage also goes up (if you watch your Gallon/Hr you'll see this).
However when measuring MPG, as your speed/rpm increases, you're also increasing miles traveled. So although you're using more fuel, you're traveling more miles and if load is constant, the two cancel each other out.