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Thanks for the posts everyone; it seems this one is not as clear cut as I'd assumed.
My reason for changing was to get closer to BFSC at highway speeds, but maybe that slight improvement would not compensate for all the other considerations. The GP runs about 2500 rpm at 70 mph
Big Dave, I understand the flywheel concept and agree that getting to speed would take more energy; conservation of momentum means that, unless I'm braking, I'll also coast further due to the additional energy in my wheels/tires.
It sounds like the verdict is out on whether or not this approach improves MPG....
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