Bolt-ons = less restrictive, Better MPG???

Diversion

The real gain in gas mileage tends to be involved with a freer flowing intake, which typically leans out the engine a hair. More intake gains are based on leaning fuel out versus actual air velocity going into the engine. Leaning the fuel out will allow for same throttle position to net more miles per gallon then the stock intake provided.

A lot of us are seeing 18 or so WHP from intakes alone, makes you wonder if the engine really needed the extra air or if a stock 370Z is really really rich..

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09 370Z Touring + Sport + Nav (Status Elite Intakes) (Berk HFCs) (Invidia Q300 CBE) (Nismo Swaybars)
99 Civic Si (Daily Driver, completely unmolested stock rarity)