Rolling Hills Travel Center in Corning is warning drivers of a delivery mistake by a shipping company in which diesel was loaded into the unleaded storage tank on Monday evening, according to Rolling Hills Casino and Resort. Anyone who bought unleaded or mid-grade fuel at Rolling Hills Travel Center between 7:40 p.m. and 9:30 p.m. on Monday, Feb. 17, should call Rolling Hills Casino's Security Dispatch line at (530) 528-3529.