I need to revisit this fuel economy vs RPM question. I should have said not that there's no relation, but that th relationship is not simple. Torque and horsepower are both functions of RPM, and are clearly related to both acceleration and load, which are both, in turn, related to fuel economy. I'm trying to figure out if there's any way to get to a more-or-less simple set of basic principles that you can make use of when actually driving. This is not a simple thing.
Regards -
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