Just to throw a possible wrench in your gears, to be really scientific you need A-B-A type testing where the driver doesn't know what is A and what is B. Psychology goes a long way to make things happen the way you hope they will. Maybe even A-B-A testing where there is no difference between A and B just to be sure.
I do believe there is merit to reducing power to increase throttle to reduce pumping losses.
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