[diegokid]

I remember people switching to propane during the 70's. I know two old farts that still run it. The exhaust is clean, power is good. Must change the carb and of course a pain to refill. Much better choice than corn though. One of these guys live in CA, he claims that when he gets his smog check they can't believe how clean it runs. You also don't get all the carbon buildup and the engine lasts much longer.