The victory was Truex Jr.'s sixth of the season and sixth of his Busch career.
Truex Jr. led a race-high 101 laps, but had to survive a green-white-checker shootout to take home the trophy.
"I couldn't run with him (Truex Jr.) said Biffle. "We're getting outclassed every week and I'm getting tired of it."
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UPI Sports Results for September 19, 2014