Before heading out to fill-up,
Note: The best price may not be best deal for you if the station is further away and/or you don't have other errands in the area. Try to fill up when you are in the vicinity of the station w/the best price. Also, consider points you've earned at Kroger or Martins. (i.e. if you've earned a $.30 discount at Kroger, this may be best deal you'll get.)
