Chucky, the key words are "engine specially built". My Dad had a small RV built on a Dodge chassis. It ran 360CI v8, either gas or LPG. It ran fine on LPG as long you were on flat land. He switched to gas when he got to the hills. If you build an engine (to get mpg and power) for an alternative fuel, then the probability of running gas if you can't find your fuel is not good. I seem to recall that most alternative fuels require higher compression and larger jets. Which means on gas you will be pinging and running rich. Since the "powers to be" here in the USA have decided that alcohol is the alternative fuel of choice I've built an engine for alcohol. I've just got it together and ended up with more compression than I wanted 11.0:1. I'm having to push softly on the pedal, which is really frustrating, because this 292 has monster torque.
I just did a search for "price of LPG", kind of interesting, the first two pages of web sites were all in the United Kingdom or Australia. I seem to remember the last time I bought LPG it was two something a gallon here in California.
Larry
