His math is correct, but his example is questionable depending on what unit he is talking about.
The
Butlers will burn that much more fuel but a typical slide in will not. Our PC units only burn a gallon an hour and they have the big Nissan.
He is right about additional cost of the bigger motor initially but it seems like its a trade off of "pay me now or pay me a little more for secondary fuel along the life of the unit."
If you're an owner op the time to get you fuel is just your time but when you run a fleet of TM's and you sending tech's to fetch propane, not only is the fuel going to cost but the time wasted getting it.
As far as Myth busted, I think its salesmen hype. It can be argued either way. Honestly I don't feel there is a right or wrong, but its a personal or financial preference that needs to be decided when you're looking at units.