I have propane and love it. I find usage to be about 10:1. My propane tank is 6.8 gallons (DOT approved and frame mounted), my diesel tank is 40 gallons. You can pick up mileage and power from the setup. I originally had a Bully Dog unit until it failed. The unit I have now I built, very much like the powershot 2000. I used a propane regulator mounted at the tank and set to 0 psi.(modifications made to regulator) run propane hose up to the engine where I have a filter/shut off solenoid. From the solenoid it goes into a NOS nozzle mounted in the air intake.(allows for jetting) The solenoid is operated by a on/off switch in the cab and goes thru an adjustable Hobbs switch. I tapped into the intake system for boost reference and ran a tube back to the regulator. I have my system come on at about 5psi and as boost goes up so does the propane pressure.(just like a boost referenced fuel pressure regulator) The system comes on easy and as your turbo spools up more fuel is added. This system I like better than the one I bought from Bully Dog and can be hidden. I wish I still had a larger propane tank so I wouldn't need to fill so often. Being a frame mounted tank, I ran a remote fuel valve back behind my rear license plate and got a hinged, spring loaded license plate frame. Love pulling into propane shops to fill up and look at confused faces while they fill my tank and swear they thought my truck sounded like a diesel. My Bully Dog system had around 50,000 miles on it and my current setup has about 60,000 miles. Maybe at some time I will try to get pictures and a list together If there is any real intrest.