I dont get that far west, but here are a few spots en route or on the ay back that are good.
On I-80 you are passing right by the exits for GNR Cajun Connection(exit # 81) in Utica, In Lasalle there is Johns North Star(exit # 77) - great fried chicken, and the exit a little further west for Rip's(exit # 70 in Ladd, IL. - some of the best fried chicken in the state.
Also Princeton(exit # 56) a little further west has alot of antique shops, and a bar called Schooners that turns out some great beer battered mushrooms.
All of these spots are a little further east than Sheffield, Keep in mind Rip's and Cajun Connection & Johns North Star do not open til after 4:00 p.m.
There are threads on all of the above spots on LTH.
Also if you head south on I-39 to Oglesby there is the Rootbeer Stand that has great rootbeer, the best burger Ive had this year, and pork tenderloin sandwiches
From east to west:
Cajun Connection
897 E. U.S. Hwy 6
Utica, IL.
http://www.ronscajunconnection.comThe Rootbeer Stand
225 N. Columbia
Oglesby, IL.
Johns North Star
1840 Saint Vincents
LaSalle, IL.
Rip's
311 N. Main
Ladd, IL.
http://www.ripstavern.comHave a nice trip out west to pick-up that pig.