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using higher octane does improve gas mileage however (someone correct me if im wrong) i dont believe the improved gas mileage makes up for the 10 or 20 cents more per gallon you will pay
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2002 Z-28, 6-Speed, Borla Cat-Back, SLP Y-Pipe, SLP CAI, SLP lid+filter, BMR SFC's, Pro. 5.0, DMH electric cut-out, LS7 Clutch, Bilstein HD's
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