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I average around 20-22 driving around during the week and on my last road trip I averaged 29mpg with a average speed of 75mph. With my Goodyear Eagle F1 GSD3's in 245/45/17 in all 4 corners and my JWT Popcharger it did seem to help my mileage a little bit. From what I have seen the majic number for my car is 77mph. Any faster and my fuel mileage starts to drop.