I am a pretty big Shell supporter, but my local Shell just closed. They must have been supporting terrorism or something, I don't know. The closest stations to me now are Mobil, BP, and Sunoco. I have used Sunoco and BP with no luck, both worse MPG than Shell, oh, and the butt dyno. So, my question is how is Mobil gas, does anyone have any info on them? How is there gas compared to Shell, additives and such?