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more specifically, in three cars he stayed with mobil1. so there will be no mileage change. in the other three RP test cars, only one was running mobil1 prior to initiating the test. He did state that on the mobil1 car, the owner reported 10-15 miles more to the tank over mobil1. (quite a few on this forum have experienced the same).
1991 300ZXTT. Stage 6+ _1993 Corvette ZR-1. Stock __1993 Jeep Wrangler. Soon to be LT-1 powered
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