Propane: 91,690 btu/gallon
Gasoline: 110,250 btu/gallon
Diesel(#2 fuel oil): 142,800 btu/gallon
These conversions numbers may help. They represenst the amount of energy each fuel type contains per gallon. Its easy to see why and by how much that diesel engines get better gas mileage than a similar gasoline type. The problem now is that diesel has become so expensive to refine for the emmissions requirements that its mpg upside does not pay to the additional $ at the pump. The propane energy component is lower than gas or diesel. Is it cheap enough to make it viable? Based on the energy content numbers i would expect to see mpg suffer as well as engine hp output. It may be a good option if its cheap enough to run. If anyone pulls this off PLEASE, keep us posted <img src="/forums/images/graemlins/patriot.gif" alt="" />