Join Date: Jan 2009
Thanked 64 Times in 60 Posts
Most guys don't really run propane because the benefits aren't really worth it. Trying to gain mileage out of it, works to a small extent, but then you have to pay to refill the propane, so there isn't much gain there, and given the cost of a kit, it will take a long time to break even if you ever actually do.
If you are trying to get some extra power out of it, and not just using it to gain a more complete burn of your diesel, you encounter high cylinder pressures and put your headgasket at risk, especially if you are running advanced timing and/or higher boost levels.