Foursquare Gas Discount: Check in at Murphy USA for $2.50 Off Gas

  Use Foursquare to check in at a Murphy USA or Murphy Express gas station and get $2.50 off your purchase of $30 or more until May 31, 2011. If you don’t have a smartphone, print the $2 off $20 coupon below. It’s valid until Memorial Day — every penny counts at the pump, so take […]