That part could be consider an overdrive, and may help in mileage,
unless the RPM dropped below it's efficient range. It's the weight, same
reason Hot Rodders want a light aluminum flywheel.
God Bless America, ßill O|||||||O
http://www.billhughes.com/

Lee Ayrton wrote:
>
> Isn't there a leverage problem involved, too? You're asking the device to
> move a slightly heavier weight at the end of a longer lever (the radius
> from hub to ground).