[Doc-Z]

I have a N/A car...HOWEVER, in my old Grand Prix GTP, it was IMPARITIVE you used premium gasoline in the car. If you didn't you would get KR and the engine would self destruct. I knew several people who split cranks and threw pistons because of this.

The newer cars have KR sensors and the octane of the premium gas operates and detonates in a certain way that the engine needs. I think these Ecotec engines are less prone to imploding...BUT

1). Why risk it
2). who said those sensors are working properly?
3). If you use lower octane gas, the engine will be unhappy...and we know what happens to unhappy engines!!!