cangim said: I've had the truck on a dyno on several occasions. The first time, it was almost completely stock, with the exception of a TYMAR intake. While other stock trucks were in the 180-185 hp range, I was at 194. Then, after adding a downpipe, 4" exhaust, and Diablo Delta chip, I ran 215rwhp with the "tow" chip, and 220rwrhp with the "extreme" chip. Later, I added propane, and without really getting the system adjusted properly, I ran 245. At the same time, my friend, who has a truck with very similar mods ran 284. I knew there was a lot of untapped potential in the propane system, so I removed the entire system from the truck, with the exception of the tank, and modified all the valves, fittings, and hoses to maximize flow. After putting it all back together, I'm getting a whole lot more power, though I haven't had it on a dyno since the re-install. I will be dyno-ing the truck this Saturday in a local truck club event, and expect to be around 300rwhp, which is about as far as you can go on stock injectors. An intercooler and Baby Swamp's injectors are on my "to-do" list, and should put me in the 360-375rwhp range.

Ggg6 said: I've got a Powershot2000 system which is vapor draw. It has been extensively modified, though. The supply line for propane vapor was originally 1/4" ID. It's now 3/8" ID, for example.

rssnape said: I fill my propane tank when I'm getting fuel, only much less often. I fuel up at a truck stop that has propane as well, so I check my tank after 1500-2000 miles, and the next time I fuel up, I top off the propane tank as well. I only have to pay for what they put in, so it's relatively inexpensive to fill up. The most I've ever spent on a tank of propane is about $14, but that was when I had run it totally dry, and had been driving for 3000 miles since the last fillup.
If anyone is interested, here are some pics of my system:

Here is a side view of the truck, so you can see my tank mounted under the bed.
Here is a close up shot of the tank and valves.
Here is a close up of the control module, which I've mounted under the hood.
Here is a shot showing the line running from the control module to the intake.

If there's anything else y'all want to know, I'd be glad to share the info.