I put a lightweight flywheel on my Turbo Miata. It was about half the weight of the OEM flywheel.
The car did accelerate noticeably better. Especially in 3rd gear, when traction was not as much of a problem.
However, I lost all of the kinetic energy stored when upshifting. The high RPM's of the engine more quickly dropped off upon the shift. So, there was less of a surge in acceleration immediately after the shift.
I always got 27MPG, no more no less. The flywheel made no difference in MPG.
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