The other reason I've done it is I'm going into Chicago. I'd rather fill up south of I80 than pay the even higher prices in Chicagoland.
A stop at Wally's in Pontiac usually does the trick. It's Buc'ees on the 5/8ths scale, LOL
There's a BP just south of i55/Central that has prices equal to suburb prices in an emergency as well.