I seem to remember that many, many years ago I read that an engine is at its most efficient when delivering peak torque. I also read that many oil fuelled ships delivered the best balance between range & speed when turning over at revs equating to peak torque.
If you are running the car at revs closer to its peak torque output, might that explain the apparently better economy when the engine is turning over at higher revs - closer to peak torque revs??
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