The Illinois Tollway system currently has tolls at roughly 5 cents/mile.
I see that at their website. Surprises me because there are stretches of freeway that cost a pretty penny to drive back in the ‘70’s when I lived in MI. Not the Ryan or Eisenhower, but farther out. When I look now, everything’s “Illinois Tollway.” I think they were separate systems before.
Compared to the tolls in S. CA, $2.50 for 7 miles seems about right. The rates vary depending on the time of day.