aircraft (piston prop) are 4cycle engines and function the same as our automotive engines, some aircraft engines can use 87 octane auto gas, you have or may have to tune a little to take full advantage of 100ll,aircraft have to lean out at higher altitudes the fuel has to be adequate at sea level as well as at altitude, Its has lead and isnt taxed like auto gas so dont tell a highway patrol man your using it cuz its a big time crime if you get caught with it on the streets. I used it in my 03 hemi pick up and it ran great but the o2sensors dont like it.