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flywheel
With my first Karmann Ghia,I had the flywheel shaved for the same reasons as you mention.With meticulous record keeping,and a big baseline for the car,I could never distinguish any benefit at the pump.The inertia of the flywheel,compared to the overall mass of the car and moments for the other rotating components evidently was below the threshhold to affect any measureable improvement.Wish it had been a different outcome,as the whole exercise was very costly to me.-------- Hope you have better luck.
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