He’s an idiot for picking propane then. Less energy density than diesel, giant surface mounted FAE, little top cylinder lubrication. It’s also going to be a LOT easier to get a refill or put a few gallons in with that as opposed to a room temperature liquid fuel.
In a SHTF scenario your propane supplied equipment is probably at its end of use when that tank empties (unless you happen to have a nearby sealed sewage pond you can cap and draw gas from). With most of the other liquid fuels you can gain additional use with added quantities garnered over time. In some instances you could actually make it, particularly with diesel or alcohol capable engines.
My propane supply is much more reliable than your deisel supply in a SHTF scenario.
-SB
But, propane isn’t “evil” gasoline or diesel.
There is one advantage with propane.
Gasoline and Diesel tanks are / have to be vented. This will produce condensate water in the tank and even with biocide and Stabil, the fuel life would be about a year at most.
Propane in a sealed system will last for several years and still be good.
Really, the best is being hooked up straight to natural gas. Even with the electricity out you have a continuous fuel supply.
Personally, I would go diesel, but I have diesel trucks and heavy equipment so the supply would get rotated and not just sit until needed.