e10 does a better job of cleaning combustion chambers than oil does.Actually, you can burn it in car engines but you must dilute it first. If done correctly can even improve a car engine and most 4 strokes. The trick is you must dilute the mix ratio to 640/1. I run 640/1 in all my 4 strokes and they all run extremely well. The small amount of TCW-3 has the ability to clean combustion chambers without harm to anything including the cat converter. This means for every gallon of 50/1 you must have about 12 gallons of straight gasoline.