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Propane sucks... the advantages do not outweigh the pain in the ass that it brings.
If you are running a 14:1 compression engine that needs race gas, it's great cuz it's rated at about 110 octane. That makes it worth the 3.50-4.00 a gallon since you can't get 110 gasoline for lest than at least 7.00 a gallon. If you have propane heat at your house, you can get a wet tap installed on your tank and pull from there, and get it from whatever your lock-in rate is. (mine is about $2.25 a gallon). That can save you a lot of money, but still is a pain.
It only runs at about 85% the efficiency of gasoline. So it takes you 10 gallons of pane to get you what 8.5 gallons of gas does. This also means that a 300hp motor becomes a 245hp motor, etc. And that's only if you have your mixer tuned perfectly and have no vacuum leaks anywhere at all. With any vacuum leaks or an improperly tuned mixer, it will drink the pane about as fast as you can imagine. Also, it doesn't run at high rpm's like gas does. Even if your mixer is rated at 600 cfm, etc, that is only for short spurts, like 20 seconds, etc. YOu will find that on serious hammer down hill assaults, you will be starving for fuel. That's also not good for your motor to run lean like that, especially at higher rpms.
Other pain is having to carry a **** ton of fuel with you when you go on a 3 day wheeling trip, especially when running it on a small block V8. You will have to run 2 tanks on the rig for sure and have at least 4 at camp if you want to wheel for more than 2 days. There is something to be said for being able to run to the local gas station and filling up.
I am by no means a propane expert, but I have some decent first hand experience with it. I think it has its place on toyotas, samurais, etc. Smaller cubic inch engines that draw less fuel. I know toyota guys that swear by it and won't run anything else. But I have never heard of any one running it on a v8 for more than 1 or 2 seasons before getting fed up with it.
Just my 2 cents, take it or leave it.
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