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All I know is freeing up the flow of the intake & exhaust means the engine will require more fuel.
He needs to do show on the basics, I've seen guys w/ cars that have t-stats that are stuck open & the engine never warms up(gauge is always near C), they didn't have a clue it effects mpg at all. They think their cooling system is just fine. Or the guys who ignore the check eng. light. Or hauling around a bunch of junk.
I think mpg is improved more by the quality of the combustion than by more air flow.
Didn't the show HORSE POWER do a mpg Camaro build last year, I think they put a cold t-stat in that one, cai kit, exhaust, ignition upgrades, & headlight covers. Their gains weren't too impresive. They called it the mean green machine I think.
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