I won't get into the BTU and energy content nonsence. If your looking for that stuff you can find it around the web easily. I'm not trying to spec one over the other.
Many people have asked me why I'd want gutless propane. Propane performance comes down to tuning. Having driven a few different propane powered vehicles, all the good performers where tuned. The others just had the propane tacked on with little or no regards to eeking out performance. The problem is compounded if your running dual fuel. However taking some time to optimize rather than ballpark with dual fuel nets you a decent system.
My primary reason for looking at LPG is long term cost. Propane being almost half the price of gasoline, it will not take long for the conversion to pay itself back.

The basic propane system consists of a tank, hose, regulator/converter, and mixer. Thats it. Simple and straight forward. Tank selection being one of the tougher decisions that need to be made. It can be both limiting, and unlimited. Limited if you are restricted to certain locations for the tank (size, quantity), limited in the sense of range (you do get worse fuel mileage on LPG, you might want a minimum volume) and limited in how much you want to spend on a tank. More tanks, more cost. On the other hand, You can mount any number of propane tanks, just about anywhere on or under the truck. Single tank in the stock fuel tank location, a second tank on the opposite frame rail, a third tank underneath where the spare resides, a tank across the front of the bed, two slim tanks on either side of the bed above the tire wells, and any combination of the above. You could go nuts and line the entire bed with tanks--4, 20x60, 218 liter (50gal.) tanks could be put in the bed... Cost 3 bills to fill em all up at the same time, you won't have any bed space, but you'd have one hell of a range (1600 miles at 10mpg).

For automotive propane tank information check out Sleegers Manufacturing.

Other things to address when converting to propane (keep in mind this information is based on what little information I could dig up on the subject of automotive propane conversions.)

One more advantage to propane when I was trying to find information on sub-zero starting and operation. Propane has a lower freezing point than gasoline! So, no need to worry about delivery lines freezing in the winter. (Propane vaporizes at -42C, freezes at -190C) In effect, propane is fuel injection, without all the electronic garbage associated with gasoline fuel injection systems.

Other propane sites can be found on the Links page.

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This Page Created By Alexander M. Bilan (
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February 16, 1997
Revision 1.9 May 3,1997