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It sounds to me like you have the right idea there just by thinking through it logically. The only thing I see that would be an advantage for heavier wheels would be while EOCing because they will have more momentum and thusly continue to role longer without assistance...but I don't have any proof I'm just thinking it might act similarly to a flywheel on a car. Heavier flywheel equals better gas millage then a lighter one because it can idle at lower RPM without stalling.
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