My 2004 topkick 6500 with a Cat C7 and Alison transmission does a good job hauling my 40 foot fiver. I fulltime so it's loaded and heavy. I don't put the miles on it like a commercial guy would though.
I have had dually diesels in the past, braking was always a problem and running at or near max weight.
Guess I am getting around 9 mpg, never really did a long term test.
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