One of the guys at work turned me on to this the other day. By adding propane to the air mixture you supposedly get more complete combustion, better horsepower, better mileage, lower operating temps, etc. Basically too good to be true, right?
Has anyone tried it or have any input? Says it needs a propane vapor tank. I'm assuming that means you couldn't pull directly from the onboard tank?
I haven't looked too deeply into it, but wondering how the savings from increased mileage stacks up against the cost of the propane you're using.