My stock tire size is 145/SR12, and Im running 155/80/13's up front. Multiply your miles by 1.077 and youll get your correct mileage. Its actually a pretty big difference.
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'05 Outback XT, 19 mpg
BP-turbo 93 Festiva (long gone)
1/4 mile - 12.50@111.5
Best MPG - 36.8
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