I have a 2010 F150 4x4 Lariat with the 5.4 and have found that certain fuels give less mileage than others. I was getting 13 to 15 mpg when using Kroger and SAMs club fuel in town and 17 to 19 mpg on the highway. I started using the Conoco station around the corner from my house and now I get 15 to 16 mpg in the city and 20 to 21 mpg on the highway
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