Well, I got interested when there was almost a $2 difference between propane and gasoline. That gap has closed up for now. I could put a hose on my 1500 gallon tank but that would be dis-legal to not pay tax.
Right now the biggest attraction is that, as I understand it, all propane comes from here. So it is kinda like giving opec the bird.

And besides all that I have a 92 F250 with a propane set up on it so I have most of the right stuff. I thought I could drive the 92 but I just can't stand to have that much plastic around me when i drive so I plan part it out, put the ZF onto a 300 in my 69. And maybe build a propane 300 out of a spare I have.