I just don't see an advantage using propane on small engines. I probably burn 30 gallons of gasoline annually, which is a lot of mowing for a "homeowner". Handling concerns, special carburetors, regulators, the lack of lubrication in propane all add up to it just not being worth the squeeze. Add to that, if you take it into a shop to have it repaired (heaven forbid:ashamed::biggrin

who is going to be qualified to uh, repair this one of a kind monstrosity?
Wow, the main complaint from commercial mowers is ethanol ruining their fuel systems.
I don't understand your statement of "lack of lubrication in propane". Propane actually increases lubrication since there is no "wash-down" of the cylinder walls.
Engines on propane typically outlast their counterparts by 2.5-1.
Honestly, I've heard these statements before when making my travels for the Kawasaki Schools throughout the US and I really don't know where they originate.
My guess is with Exxon, Shell, Saudi Arabia and BP...
Edited to add: "One of a kind monstrocity"? Exmark, Toro, John Deere, Honda, Dixie Chopper, Bad Boy, Walker, Scag and many more offer OEM propane units. There are more than 17000 Nationwide. The National Mall (Washington DC) is mowing with propane as is Augusta National. Perhaps they don't know of their error?
Yes, I know I am answering a post that is two years old but I hear the same statements almost daily. They have no basis in fact.