(AP) — Jeff Gordon's mistake on pit road helped sour a promising weekend at Talladega Superspeedway. Penalized for speeding on pit road, Gordon was dropped back to 30th for the final restart Sunday after spending much of the race up front. Hendrick Motorsports had the strongest cars in the field, and it was clear Gordon was a contender for the win. Because this is his retirement tour, Gordon had even hung out with friends on Talladega's boulevard, a party spot he'd avoided for at least a decade. [...] Hendrick teammate Dale Earnhardt Jr.