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...it "takes" a certain amount of power to drive 55mph due to aero+rolling losses, so ANY improvements in power (HP) "making" ability--if bi-lateral--can likewise (usually) yield improvement in fuel economy (MPG).
NOTE -- by "bi-lateral" I mean something that's NOT just a "oneway" change, such as changing from smaller diameter carburetor jets (good for MPG) up to larger diameter jets (good for HP, but kills MPG).
...headers are a "give & take" situation--they "give" you power at the engine speeds where they "tune" but also "take" power at intermediate engine speeds...kinda like childrens' "teeter-totter" where one end is UP while the other end is DOWN but the 'middle' (pivot) location never changes...the process of "tuning" is a proverbial "...rob Peter to pay Paul..." situation.
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