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Originally Posted by emory70
getting more air into and out of the engine is the definition of increased efficiency.
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What ??
No it isn't.
The definition of "more efficient" is getting more power or mileage out of a given volume of fuel.
Real world reports from riders who have done the mods outlined here indicate, without exception I think, that the engine "feels" like it has more power and runs "better" but not a single one has reported an INCREASE in fuel mileage.......or even exactly the same. The difference isn't much but it is always a bit lower. That tends to indicate that the extra power they achieve requires a little extra gas to get it.......and that is not increased efficiency.