I believe ford offers some dual fuel on some models. Propane converison is releativly simple. You genrally do not get much HP improvement, but it does run cleaner. I drove a Schwans truck that was propane powered it was a GMC, but converted from gas. Ford offered one that was Propane from the factory. In europe Propane is much more popular due to tax advantages. VW TDI motors seem to take Propane very nicely. On a normal spark ingnighted motor, you get around 80% or the power you do on gas.