Propane?

A friend of mine had a Chevy can that had a propane conversion. In the winter time he had to start it on gasoline and when it warmed up he switched to propane. He would also switch back to gasoline just before he shut the car off. I also know that the propane gas camping stoves do not work well at higher altitudes. I cannot imagine a propane powered ice auger that would be used in sub freezing temperatures. Maybe they have some secret to make it work. Billrod