According to recent research conducted by NACS, the Association for Convenience & Fuel Retailing, 63 percent of gas customers go on to spend an average of $4.82 each in the store following their fill-up. That’s an 11-percent increase vs. 2012. On the surface, this sounds like an encouraging trend, but what about the remaining 37 percent who are not converted to in-store shoppers? Are potential sales being left on the table? What role does gas play in increasing store traffic?