Gas mileage should not change that much. On my last Z I had the Tomei Expreme Ti exhaust and Stillen Y pipe and I averaged 19.3 mpg. Any where between 18-20 mpg would be the norm. Every Z gets different mpg as everyone drives different. Your overall mpg will also depend on what fuel you are using. Nissan highly recommends using only top tier gasoline is your Z.
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