The ethanol got me thinking about an old Army truck type that my dad used to talk about - I think. He said that when he was in the Army they ran trucks that could burn either gasoline or diesel, but with one of the fuels you had to add oil to the fuel (can't remember which one). Am I remembering this right? I wonder if anyone has tried this technology in a passenger car. I know the M1A1 tank can use multiple fuel types but it's a turbine. I got the impression that this was a piston engine.