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Okay well finished up the tank of mid grade chevron (89) . XFI cam,timing set at around 6 deg adv.. The cam has improved mileage around 3 mpg.. Which gas is better? Chevron or shell? I am thinking of advancing the timing to around 9-10 and run premium (93 octane) .. Just curious if my CPM would stay around .06 ..... What do you guys think?
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1993 Geo Metro- 361k on original drivetrain minus head. Best mpg of 75.23. Grille block,mirror delete, kammback, fender skirts, and 135-80-15 tires..... Oh and alot of Hypermiling techniques.
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