Longevity update old E350 shuttles vs newer Ford Transit

[user 37446]

My old class c motor home was dual fuel. Chevy with a 350 engine. Got 10 mpg on gas and 8 mpg on propane. Also, you could switch it on the fly, so for instance, if you were on propane power and came to a mountain, you would switch to gasoline for the extra power. The rig had a 1200 mile cruising range which was nice, but, we used to joke about how big a crater  it would  make if something was to go wrong.

That was my truck, basically. Switch while driving was ok. Same mileages with my 400. I dont see dual fuel hardly at all in the states, just every now and then. It's still found mostly in Canada (between the two countries).