you can use heli/airplane fuel for cars , however, you will get poor response and power. it is best that you use car fuel so you get the best performance out of the car! however, do NOT use car fuel for your heli/plane!! car fuel doesn't have enough oil for heli/plane use and you risk damaging your motor!! also, see if you can get an offroad or monster truck specific fuel. i use Maxy's Monster Truck fuel in my truggy for offroad and get better perfomance than some of the all-around type fuels!