Score another one for Dunkin' Donuts in the gourmet coffee race with McDonald's and Starbucks. Hess filling stations began installing 10 self-service counters a week stocked with Dunkin' Donuts coffees and pastries made on site. Hess, which has recently begun installing the counters in 80 stations in the Tampa Bay area, figures to finish the job in all 1,400 Hess stations within a year, said Rick Lawlor, executive vice president of marketing for Hess Corp. The move turns Hess, an oil refiner, into Dunkin' Donuts' largest franchisee. Dunkin' Donuts can make the same claim about Blimpie's sandwich shops and Godfather's Pizza. Hess hopes the quality brand image will give more customers a reason to join the 80 percent who pay inside rather than at the pumps.