Helicopter fuel is different because it has a higher percentage of oil - since helicopters don't get as much cooling, more oil is added to help keep it lubed without going too rich. if there is not enough oil, it may heat up too fast. A car doesn't need all this extra stuff for cooling - all that is needed is to cut a hole in the front windsheild for car engine cooling.
I use 15% Cool power for my heli, and for my car i used 20% byrons (smelled good when burned

) then switched over to 25% Blue Thunder for the car...
For the heli i'd rather use a lower % nitro fuel to keep the heat down so i can go a bit leaner.
So the answer is YES, you can try the heli fuel, but you will most likely be getting a lot of oily residue all around unless you have some type of rear exhaust setup.