We've used old Minneapolis-Moline gas and LPG tractors side by side. Learned the propane tractor uses 25 - 30% more fuel than the gasser doing the same work. Offsetting this is the LPG tractor runs much cleaner - the oil remains remarkable clean even after 150 hours. And the exhaust doesn't stink!
However in cold weather the propane tractor is more difficult to start - involves operating gas and vapor withdrawal valves in proper order and at the proper times as the engine warms up.
Finally you DON'T want to let an LPG tractor run out of fuel in the field (you can't simply dump in a couple gallons from a jerry can, fire it back up then run it back to the barn!)
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Somewhat related, the school district I occasionally drive bus for is phasing out diesel and gasoline engines in favor of liquid injected propane buses. Fuel mileage differences are significant: A gas bus will deliver 5 - 6 mpg on a 100 mile trip; the LPG only 3 - 4 mpg. (The older diesels are good for 7 - 8 mpg...)
Also the LPG buses are slower to get started - hot or cold. After turning the key there's about a 1 minute wait while the fuel system purges/pumps and the computer actually cranks the engine.
However the LPG buses have plenty of power, and the exhaust smell is much more tolerable.
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