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In the Civic VX they went with a lighter flywheel and lower idle speed. Not the smoothest idle but at 450 RPM you can just about feel every power stroke, and idle fuel consumption is very low, probably about .12 GPH.
I have seen car with very light flywheels where the gears in the transmission rattled against each other in neutral, even at idle speeds above 1000 RPM.
I would imagine there would be a benefit up to a point in lighter flywheels. The question is where is the point where the consequences of a lighter flywheel become significant.
Only one way to find out, I guess, but you wont see me swapping flywheels to see which one gets me 1% better mileage. Instead I would do some research into the difference between the stock 94 Civic and the VX flywheels, which would give you a fairly good idea of what Honda did to get the best mileage possible.
regards
Mech
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