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No great experience speaking here, but it seems to me that it doesn't matter where you store the energy, in a battery or in a flywheel, energy storage capability should reduce fuel use. Kinematically, it's the same idea as P&G.
However, were that the case, folks would be looking for the heaviest wheel/tire combos, as the roadwheels are part of the same rotational system as the flywheel, albeit with a variable RPM relationship. I see the opposite happening, judging by this thread. (the onein Success Stories about "prius-15s-better-than-aftermarket-17s-wrong-wheels-23509")
So is wyatt seeing wheel-tire differences, or is leanburn's logic (post 5, claiming low mass is better) at work here? If so, why is the result different from what kinematics leads one to expect?
HAve fun,
Frank, who on post #1, will remain linkless
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