Gaughan, who pushed his Dodge to the front for the final time on the 50th of 160 laps, led the rest of the 200-mile race for his third victory of the season.

Leffler, also driving a Dodge, closed the gap to 0.222 seconds at the checkered flag but his final challenge -- in Turn 3 of the 1.25-mile speedway -- fell short.

Travis Kvapil finished third in his Chevrolet to preserve a 34-point championship lead over Gaughan after 12 of 25 races. More