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I have also been reading about this flywheel subject. My two cents, weight will hurt economy, no way around it. BUT a engine designed with a heavy flywheel might get great gas milage. Eg. a 440 big block in a 69 charger with a super light flywheel will probably get worse gas mileage than xfi metro with a super heavy flywheel. does that prove that a super heavy flywheel is fuel efficent NO. It is just that the design need a heavy flywheel for some reason. (maybe drivability)
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