Ran down from Illinoise through Missouri to Arkansas and the cheapest gas is still just south of St. Louis, MO and it always is?!? Saw $1.71 there and of course I waited too long and paid $1.82. I still see it for $1.99 in the western burbs of Chitcagoland...
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.