I know that this thread has been done to death, but i just came back from a weekend trip and thought i would post up my fuel mileage report.Approx. 300 miles each wayRunning south at 76mph with a pretty stiff head wind i averaged 17.22 miles per gallon at approx. 2200rpmheaded back north at 64mph with no wind to speak of i averaged 22.35 miles per gallon at approx. 1800rpmi am happy with these numbers but they can always improve! the speed is obviously a huge factor on the economy, but i would like to do injectors and larger exhaust in the near future. any thoughts or recommendations are always welcome.i would love to see some of you guys numbers on your rigs so post away!

" I've wondered that too; are the guys running propane figuring in that fuel with their diesel fuel consumed?? Propane around here is 1.05 gallon (bulk). I have a couple JD 4020's that are propane powered, I fill them out of our 1000 gallon tank. Also have a 8.3 litre chevy power unit that pumps irrigation that is on propane. All in all, those rigs will burn about 50% more gallons of C3H8 than similar hp diesel engines. For me, the 1.05 propane is more economical. Diesel would have to be 1.60 or less.

I'm paying over $4.00/gal for propane here. I use it to run my forge to modify and shape horseshoes that I fit on horses. Hell, if I weren't paying $3.75/gal for diesel; I'd make a run to Nebraska and fill up my 2 100# propane tanks!!!! Especially for $1.05/gal. I currently run 2 40# propane tanks in my work trailer.

I am working in Terre Haute In. I have made 4 trips back home to NC. I fill up before I leave and it is 627 miles one way and I am running 75 mph. I fill up when I get home or back to work. Every time it takes 33 gallons +or- a 1/4 gallon. That is 19 mpg. Before the RV's I got 18 mpg for similar trips.

That's without the 5'ver in tow, correct?

That's without the 5'ver in tow, correct?

That would be correct. I am empty at about 7300#. I got about 10.5 to 11 with the 5'ver in tow. That was at 60 tp 65 mph. 65 mostly.

I filled up in winnemucca,nevada drove to marsing,idaho about 221 miles put in 10.9 gls to fill it back up in marsing for about 20.2 mpg and drove about 62mph this was hand calculated.

I don't know if I am really saving money by running propane, but I sure like to use the numbers on some of the people that claim "I get 20 mpg towing my fiver through the mountains". I do know that my truck has a bunch more get up and go with it so it makes it worth it for me! Just an FYI, the price of propane varies so much across the country that I don't even look at the price anymore.......

I don't know if I am really saving money by running propane, but I sure like to use the numbers on some of the people that claim "I get 20 mpg towing my fiver through the mountains". I do know that my truck has a bunch more get up and go with it so it makes it worth it for me! Just an FYI, the price of propane varies so much across the country that I don't even look at the price anymore.......

When my truck was new I was not real happy with it. Mileage and power were not what I expected. I was talking to my wifes cousin about it and he sympathized with me. Told me something had to be wrong with it because he got 20+ mpg out of his 454 Chevy. Never could figure how big a trailer he was pulling to get that mileage.