Below are links to Fuel Locations that I use to plan where I will refuel while on a trip. All links except Murphy Oil (Located at Super Walmarts) have daily prices posted on their Web Sites.
http://www.murphyoilcorp.com/stores/
http://www.flyingj.com/
http://www.loves.com/
http://www.pilotcorp.com/
http://www.murphyoilcorp.com/stores/
http://www.flyingj.com/
http://www.loves.com/
http://www.pilotcorp.com/