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economy mileage mpg fuel

  1. 5.9L V8 Specific Topics
    I picked this thing up for occaisional offroad forays and towing duties, and like it a lot, except for the gas mileage. I've got 140K miles on it and get about 10 1/2 MPG around town and 13 1/2 on the highway. Am I out of line thinking I should get about 3-4 more MPG for each? Maybe even better...