Found this article, very indepth on how to go full propane and swithc in between.
Convert Your Car to Propane
This is def a mod I could get into this winter. It sounds simple enough and fun, I'd just like to see whether it makes sense from a fuel cost perspective. I'll have to do some more research, it def isn't a "new" idea. There are over 250,000 vehicles and equipment already running on propane full time.