What was his prev. mileage, 14.4? possible to increase 1.5 with A good flowing exhaust. Did he perform the mod in spring when the temps are rising then definatly he will increase his mileage. Lots of varibles. I would say anywhere from 1-3 mpg could be gained with A real good exhaust mod.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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