Propane is a very good fuel indeed , cheap (mainly due to taxation ?) high octane , and very clean burning wrt emissions.
The disadvantages are the need for a stronger pressure tank to contain the fuel , and the lack of widespread availability of fuelling station that offer this.
Propane is available everywhere in the USA,, we use it in our RVs and everyone hzs a propane grill. The problem is it does not have the lubricity of gasoline so the valve seats,guides and rings wear out quickly. I managed a fleet of 10 Ford ranger pickups which had been converted to propane.they were a nightmare to maintain.
