Charlene Buck, the assistant manager of the SPUR gas station on Tower Avenue in Superior, Wis., changes the gas price on the large sign outside of the store on Monday afternoon July 21, 2008. " I hope it keeps dropping," Buck said of the gas prices that slipped under the $4.00 a gallon. Oil prices tumbled Tuesday, falling about $4 a barrel as concerns eased about possible supply disruptions from Tropical Storm Dolly. (AP Photo/Daily Telegram, Jed Carlson)
Jed Carlson /