A week or two ago it jumped 10 cents a gallon in the Chicago area, too. We are now paying around $2.25-.45 for unleaded. At least that's what it was when I was out this morning. It could have jumped up again.
Doesn't Chicago have boutique gas? I know its been more expensive for many years now . . . better keep an eye on those pumps this afternoon. I hope you don't experience what I have!