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Message: <blockquote data-quote="CC379" data-source="post: 3650601" data-attributes="member: 25394"><p>on long interstate drives my 2001 5.9 Cummins usually does around 20mpg highest I remember was 21, daily driving it gets right at 15mpg. The fuel gauge broke on my 01 in Tennessee when I was pulling a 16' bumper trailer started driving 55 or slower creeping up hills was getting 20 but not how I would ever drive again. local mailman owned several diesels ford chevy & dodge, he went back to gas trucks because the mileage is about the same. he has always been a propane fan so his gas trucks run on propane not sure what lp mileage is but you know its got to be pretty lower,</p></blockquote><p></p>