Heli 30% fuel
 

Yup, not enough nitro for my NR 21. Might also be too much oil since helicopter fuel has 22+% oil while boat and plane fuel normally has around 18%

It'll work but it depends on your engine. "Small block" (.45 and under) love the nitro but 30% isn't bad. The problem is that if you're buying locally is that it's a lot better than car or plane fuel so don't let a hobby shop employee try to blow smoke up your skirt as they'll try to unload whatever they have on the shelf to make a sale. 18%-20% oil content is what you're looking for as ideal but more isn't going to hurt. Most Heli fuel is right at 20%. Like us they run at wide-open throttle most of the time so the extra oil does help.