I recently installed a propane injection system on my Ford F350. I have been very impressed with the results. My mileage went from around 13-14mpg to 21-23mpg.

Even after adding in the cost of propane, which is drizzled into the system by a computer, my cost per mile has dropped significantly. In less than one year, through savings at current diesel prices, including propane, the system will be paid for.

For anyone who owns a deisel vehicle, this technology is worth looking into.