I always put in regular old 93 octance pump gas. I'm not too picky about what brand either, though I will only use BP in an emergency. If I have a choice, I use Citgo or Shell. Occasionaly I throw in the Shell 94 octane, but I can't tell the difference. I've only seen one place in my area that sells anything higher and they closed. Of course, I could buy race gas at the track, but that's pricey.