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Air intake? Performance exhaust? What kind of oil do you run? Another way to lessen your cost per mile is to install a fs2500 bypass filter. I change my oil and engine filter at 20k miles vs 7500 miles. I change the fs2500 filter at 10k miles. I also run Valvoline blue 15w40 premium blue oil and one bottle of Lucas oil stabilizer...
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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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