Jimmie Johnson looked as if he had already finished the hardest work. After starting at the back of the pack he had moved up quickly and when he passed Brad Keselowski for the lead on lap 191 of 200 his No 48 Chevrolet seemed to be the superior car.
Then Johnson's engine faltered with only six laps remaining. He lost the race - and the NASCAR Sprint Cup points lead - to Greg Biffle on Sunday.
"I got it turned around and was catching him, and then his engine failed," Biffle said. "I felt like I could catch him, but we'll never know. Passing him might have been a different story."
Biffle won the race at Michigan International Speedway, taking advantage when Johnson left the track because of engine trouble. Johnson started the race from the back because of an engine change, and he couldn't hold on at the end. He finished 27th.