Just wondering what you guys use and what is the best and worst out there to get. I just had a tune and my tuner asked me what type of gas I was using and where I got it from. The reason is he said he usually gets 1 more degree of timing out of my set up and he just couldn't because of the fuel. He said 1 degree of timing can be around 30 whp. The last time I got gas was half of a tank of Mobil. I usually use BP. He said Shell was one of the best to use. So I figured I'd ask all of you what you use as well as to see which are the best and worst to get.