Quote:
Originally Posted by spearfish25
So if bolt-ons are less restrictive and in turn allow the engine to produce more horsepower, do they lead to better fuel economy under conservative driving habits?
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Not really true.
The engine is an air pump...
The more air that goes through it, the more fuel that also goes through it to maintain the air-fuel ratio.
Fuel economy is more or less (these days) a function of efficency of the engine and drivetrain (how well heat is translated to movement) and aerodynamics and weight.