I was just at a conference on lp power. An exec from a major automaker (One of the US big 3) stated that operating vehicles on lp gas may be cheaper fuel and the US may have a large natural gas supply but the process of making the engines run on lp was not economical? Seems to be pretty easy to run a 4 cylinder gm engine in a forklift of lp gas...maybe the automakers should call impco for help. I'd like some of the guys from the lift truck industy to voice their opinions in this area. I guarantee for 500 bucks I can make my 4 cylinder honda accord run perfectly on lp gas...which here is 2.23 per gallon!