Joe,

I beg to differ,

"Another con to LP Gas generators is LP Gas has a lot of carbon in it. That means your engines get half the life of a gasoline or diesel powered generator. I've had my 15,000 for 4 years now and it's needed multiple repairs on account of the LP Gas carbon build up."

Propane and natural gas have far less carbon than gasoline or diesel. And propane will keep your engine cleaner internally than any other fuel. If a mechanic is telling you that the propane is causing carbon build up in your engine the mechanic is either full of something other than carbon or there is some other reason for your carbon build up. As a guess i would say oil blow by or improper mixture settings. And as someone else mentioned it could need repairing just because that it is a big lawnmower engine that is designed for a useful lifetime of just a few thousand hours.

But, you are correct in that it will cost more to run an engine on propane than on gasoline. Propane is selling for around $3 a gallon and because of the lack of carbon in it, it is around 20% to 30% less fuel efficient than gasoline.

And on a related subject of gasoline storage i saw something that looked good for transporting and handling fuel. Was at the PRI Show the past few days and there was a vendor there selling fuel cans and manual transfer pumps that appeared to be well made and move fuel easily. Disclaimer, i have no financial interest in this company whatsoever.

http://www.flofast.com/

It was a little pricey, the pump was $140, and if you get a fold up dolly and a 15 gallon fuel container it jumps up to over $300. But after pouring fuel out of safety cans into generators and other equipment the fuel pump doesn't look so bad.