Edmunds Answers


  • MrShift@Edmunds 05/07/09 1:37 pm PST

    it will have a negative effect on both.

  • karjunkie 05/07/09 1:47 pm PST

    Your on board computer will retard the timing for the regular gas and reduce both the horsepower and the mileage. I would experiment with mid-grade fuel. My BMW seems to get about equal performance with mid-grade even though it calls for premium. I definetly get worse MPG and performance with regular gas.


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