Biffle wins at Michigan; Edwards finishes sixth

Sunday, August 19, 2012 | 4:16 p.m. CDT; updated 5:11 p.m. CDT, Sunday, August 19, 2012

BROOKLYN, Mich. — Greg Biffle won the NASCAR  Sprint Cup race at Michigan International Speedway on Sunday when leader Jimmie Johnson left the track because of engine trouble with six laps left.

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