Originally Posted by PratoN
You're killing me.
EDIT: I think everyone really should shop around, though. I've found a Thornton's station in Illinois nets me 38-39mpg per tank on 93 and then I fill up at the BP and my gas mileage instantly drops to 33mpg. It's happened more than once and I think it's more than just a coincidence / weather / driving style changes.
try the shell v-power at Oak Creek. maybe it's just me/placebo effect but i'm getting 1-3 mpg more