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Rich, I am not an expert on fuel or gasoline. Btu a friend of mine who runs the local co-op station has told me there are different grades of diesel fuel when I showed him my records of mileage and asked him why I was seeing better numbers from his competitor. His fuel is normally a few pennies cheaper, but my mileage showed it too. As far as diesel goes I have a truck similar to yours except I have the 6.0 and 4:10's and I am seeing 11.5 towing on the flat interstate roads we have traveled most.
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