Hey guys, I have a question... I run mid grade (89) does that hurt considerably the performance of my car.. b/c yesterday I went out and raced a stock 05 type S and I got beat! lol. I'm assuming it is b/c of the gas b/c that'll ruin my timing, and the power of the engine but I could be wrong. I didn't think gas could be that big of a difference performance wise.. but I guess all that carbon build up from bad mid grade gas must ruin it.