Funnily enough, turbine engines are pretty robust when it comes to fuel selection. Of course, if you want the engine to last a while and to develop the power then you should run it on the correct AVTUR mix. Piston engines however are pretty fickle. They will usually only run on gasoline type blends. Look what happens if a bit of water gets into the mix. Petrol in a diesel engine isn't wise. Different compression ratios and the rest. It would probably run quite hot and quite rough (ignition happening at the wrong time).
All in all, bad.