LPG has a higher octane than gasoline so can run a higher compression ratio which generally allows more power. That said, the BTUs of LPG is lower than that of gasoline so gallon per gallon one cannot expect the same work so an LPG fueled tractor may require more fuel to achieve the same amount of work. With the two fuel prices closer today than decades ago I really don't know how actual operating costs would compare.
Cheaper to operate than gasoline, probably so as the cylinder walls are not washed down because the fuel is drier so engine longevity is much much higher. I have seen a truck engine with over 100,000 miles on it, torn down for a valve job, and you could still see the factory hone marks on the cylinder walls. Won't happen with gasoline.
When properly set an LPG engine won't be any more difficult to start in reasonably cold winter temperatures than a gasoline engine. Properly set is the key. Unlike gasoline engines of old before fuel injection there is no stumbling to get the right choke setting, once running they stay running.
Hard to work on? No. They are a gasoline engine with different fuel supply. Ignition advance curves, etc. can be a little different but today I wouldn't expect you would need to make modifications of any kind on something you purchase.
Unlike gasoline carburetors the fuel delivery system for LPG is pretty bullet proof and will probably last many years without any attention.
Filling----knowledge is the biggest part of the equation which addresses the safety issue.
We had a nurse tanks on trailers for filling from. The tanks had liquid lines to fill the tractor with. Once hooked up we vented tractor tank pressure into the atmosphere via a bleeder device hooked to the vapor return fitting on the tank. Lowering the tank pressure allows it to be replaced with the liquid from the nurse tank.
A pump would be safer and better. We never had any safety problems in over 30 years of using and filling our MM & MF tractors.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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