There's a bunch of really smart people who have made those calculations, I'll see if I can find it. Propane and natural gas produce slightly less power if I remember right, but run so much more cleaner and don't cause the same wear on an engine that gas does. They've done the math on the honda 2000 series as well - how much runtime you get per propane tank or gas tank, etc. as well.
It's definitely worth it as a "plan b" - there are a lot of people commenting in threads I've read about being on east coast during the storms a few years ago. Gas was non-existant, propane was easy to get and of course natural gas almost never goes offline unless they have to turn it off due to leaks/fires.






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