Originally Posted by mishka
On recommendation from a friend, I filled up with supreme/premium gas (93 octane) yesterday (my friend said it can't hurt the car and its "good to clean out the car" with high octane - once a month he said). On the way home I noticed what felt like more power! In addition, the car was quieter when idleing/coasting yet louder when accelerating! It even shifted smoother and less jerky and overall the thing drives all around better and smoother. I love it!
In the owners manual it states that higher octane gas will increase performance.