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Originally Posted by 914fan
The flywheel weight affects cruising more than anything.
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With a heavier flywheel you can cruise using less fuel.
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I disagree; at a steady speed the weight of the flywheel is virtually irrelevant and will have an insignificant effect on fuel consumption.
Removing weight from the flywheel is exactly the same as removing weight from any part of the car except that gearing comes into account so that removing 1 lb from the flywheel is equivalent to removing around 15 lbs from the body weight (in first gear). The effect is the same; it allows the car to accelerate faster for a given force applied.