Busch conserved enough fuel to finish ahead of the field after taking the lead from his younger brother, Kyle, who ran out of gas with less than three laps to go.
"I saw (Kyle) peel off a couple of laps before us, and I wanted to get to him, but I didn't want to get there too fast because you got to save a little bit of fuel, but yet I knew what we had for fuel mileage," said Kurt Busch, who also won a race in Atlanta in March.
Jimmie Johnson, the cup points leader, crashed early and, after repairs, finished the race 129 laps behind.
Johnson had his lead cut from 184 to 73 points over Martin.
The lead remains "respectable," Johnson said, adding, "I hated that we gave up all these points tonight."
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