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I have done some calculations on my mileage and the results are not so great! looks like I am getting just over 7mpg!!! What the heck. Dualls 4x4 make a huge differance or what? not sure on my rpms at 75mph cause we don't have a very straight rode around here. Lots of steep hills though.
I have a 97 crew 4x4 F250 and get 14 MPG in the city (35MPH) and 18 MPG on the HWY(70MPH) . That is at sea level with a pint of 2 cycle in the tank and a little DieselKleen.
Up in the mountains 3000-8000 feet on hilly roads going 40 MPH consumption goes to 10-12 MPG.
these trucks didnt come with 3:73s? only the superdutys, we have 4:10s or 3:55. and im screamin at 75 wiht 4:10s but my last truck has 3:55s and loved it on the highway. ***70mph***edit** was like 2100 i think.