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It entirely depends on driving. At perfect constant speed, fuel economy will be exactly the same (never the case in real life though).
On highway driving, the difference is almost negligible. In city driving, hypermiling techniques are decisive to take advantage of the energy that has been stored in the wheels (even though we never get all the energy back).
I think rotational weight influence is largely overestimated : 4-10 times might only be at full throttle and the overall factor is much lower than that even in city driving.
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