The numbers suggest (with Indiana at -3 cents margin and Michigan holding on at 1.8 cents margin) a spike is possible tomorrow. History shows, however, that two spikes in a week are really rare. With margins this close to break even, that makes the likelihood that a spike will happen to be very low.
If you need a fill up and can get gas in the $2.30s in Michigan, or below $2.30 in Indiana, you may wish to do so tonight as spike insurance. But like all insurance, you may not cash in on it.