I don't really know how that's possible to put solely on gasoline unless you're driving 35MPH 100% of the time, all the time, and using the same gas from the same pump / station all the time.
My Denali HD 2500 is pretty normal, but 2MPG is the difference between me speeding or not on any given day. But the type of diesel used isn't going to affect it that much, nor would I ever care to count pennies like that. If I have to worry about that, I have bigger problems to worry about. ;)
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