I knew a guy in Tx, who ran his pickup on propane, back in the 70s. As far as I know, he didn’t have any problems with it, but only as far as I knew. Zamboni machines run on propane. I have driven one before. The guy I knew in California, had a Honda Civic, and it ran on natural gas. There is not very much in the way of infrastructure, so he is limited as to where he can drive it.
“I knew a guy in Tx, who ran his pickup on propane, back in the 70s. As far as I know, he didn’t have any problems with it, but only as far as I knew. “
It used to crater the valve seats after a while on engines designed to run on leaded fuels.
The propane delivery trucks used to run on it years ago as many tank trucks were gasoline powered allowing conversion. Now they seem to be all diesels.