[edmonton72]

I'm asuming that you are talking about propane. I have also thought of doing this conversion too. There are some good and bad things about running a truck on propane. The price of propane is about half of what gasoline is. The conversion will cost around $1000. Propane also has a high octane rating, 100-110. So you could build a high a compression motor and burn cheap fuel. Some of the downs about propane is that it wears out your engine more. It burns at a hotter tempature then gasoline so your engine will wear quicker. One common problem is that valve seals wear out. So if your going to do this build a motor to run on propane or at least get your heads rebuilt. Propane isn't also as eficeint as gasoline. If you get 8 mpg now you'll probably get around 6 mpg with propane.

Check out www.gotpropane.com and also do a search on google.