My 2003 Topkick has a 8.1 gas motor with factory propane conversion (ex Schwan's truck). First trip out 6.5 mpg in hilly Pennsyvania, still learning gear selection and throttle position for grades. My 8.1 gas dually with the same trailer gets 7 mpg. But propane is generally way cheaper than gas or diesel so I'm ahead of the game on the swap. One of these days when I have some time and somebody tells me how to post $%^&* pictures on this site I will start a build thread.
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