Moparal,
if you actually go into Chicago please note the prices there; I try to stay as far away from that place as possible, but they were always $0.15 - $0.25 more per gallon than where I'm at in the NW burbs due to the insane taxes. When my friend was there the last couple of times I posted he once reported $0.30 and once $0.20 higher than what we saw here at the time.
The corner Mobil was at $2.07/gal for regular today, $2.27 for midgrade, $2.37 for premium. I just found a receipt from my wife's car (which takes premium) where she paid $4.49/gallon at this same station on September 24th.