Propane has less energy per gallon as compared to diesel or gas. Propane engine is also less efficient. So - propane is more expensive to run unless you live somewhere that's it's abnormally cheap (as compared to the US average).
Where I live in central NY our school almost wasted a ton of money on new propane school buses that were going to cost near twice per mile that the diesels did. That was when propane was $3.20 per gallon and diesel was $4 per galllon.
Right now - in central NY: $1 of propane buys 30,500 BTUs of energy $1 of gasoline buys 31,754 BTUs of energy $1 of diesel (at the pump) buys 32,500 BTUs $1 of farm diesel buys 37,249 BTUs of energy
The new school buses our school district looked at came in diesel versions rated at 7-8 MPG and propane rated at 4-5 MPG. The math is pretty plain.
With farm tractors? Look at Nebraska tests. Propane tractors are the lowest efficiency. Rated by horsepower-hours-per-gallon. The lower the number the more of fuel-pig the tractor is.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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