[ghostrider]

Originally Posted by hot rod

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.

I had a Westport CNG conversion - which got me about the same mileage as your Schwan. It was designed for inter-city transport, not open road. When I drove in Germany it was all you saw - COE's with dual fuel.