There aren't any diesel engines we use that can substitute gasoline for diesel fuel. The old Duce & a Half was multi-fuel but they are all gone now for the most part. All the Army stuff has to be compatible with JP-8 in accordance with DOD Directive 4140.25 and AR 70-12. JP-8 is the primary fuel for the battle field but diesel engines must be compatible with JP-5, Jet-A, Jet-A1, JP-4 & Jet-B is gettting hard to find. It is HIGHLY recommended that a VERY GOOD fuel additive be used with these fuels to keep the pump and injectors lubricated. I use John Deere fuel additive in my Kubota and Cummins and the Army uses this and other additives. We run our John Deere 4710 flight line tractors on JP-8.