Propane as gasoline replacement

[granatl]

This question is not about propane injection.

With gas climbing way too fast in Las Vegas, it got me to wondering what it takes to convert the GN to propane. Does anyone have a list of things that would have to be changed? Estimated cost? Any difference in MPG? (I seem to think it's ~130 octane)
I'm aware of the safety issues, but I'm more interested in hearing the mechanics of installing it.

 

[77tech9]

You lose more then you think with propane, it's good for daily drivers, not for GNS.