Propane has 1/3 less BTU's per pound than gasoline . which means you need more to go the same distance . The big advantage of propane is that it burns a lot cleaner , less imessions , longer engine life and extended oil changes . Propane is under much higher pressures so there is a danger of explosion . Another alternative is compressed natural gas . Same benefits and dangers . Propane is a by-product of oil refining and is almost cost free . Compressed natural gas comes out of the ground ready to use . The only cost is pumping . Which begs the question : why aren't more vehicles using it ? Politics !
