If you use neat mogas in your Enstrom you will probably destroy it in no time. Adding lead may help but I wouldnt do it. When I bought mine, my engineer showed me the damage done by alleged occasional mogas use in an Enstrom. Disastrous. Engine written off in 300 hours. Stick to 100LL. You may get away with it in a Robbie but you`re pushing it in an Enstrom. They run much closer to detonation pressures.