BROOKLYN, Mich. —
Dale Earnhardt Jr., who won at MIS last June, finished 37th Sunday. He led for 34 laps, but his engine acted up about two-thirds of the way through the race.
There were eight cautions for 38 laps.
Biffle cruised to the finish in his No. 16 Ford. He finished second to Johnson the previous weekend at Pocono, but this time there was nobody left to challenge him at the end.
It was Ford's third Cup victory of the year — Carl Edwards and David Ragan won at Phoenix and Talladega. Sunday was Ford Motor Company's 110th birthday.
"There have been a lot of great teams and a lot of great drivers, a lot of great engine builders that have contributed to Ford's success," Roush Fenway Racing owner Jack Roush said. "I'm just proud and honored to be part of that."
This was the second Cup win of the year for Roush Fenway.
It's been an emotional week for the racing community after the death of driver Jason Leffler on Wednesday at a dirt-track race in New Jersey. Biffle was quick to acknowledge Leffler while he celebrated his Father's Day victory.
"We are thinking about little Charlie Leffler that doesn't have a father today," he said.
Biffle earned his 19th career victory and boosted his chances to reach the Chase for the Sprint Cup, moving from 10th to eighth in the standings. Biffle finished in the top 10 for the 13th time in 21 races at MIS, which is about 60 miles from Ford headquarters in Dearborn.
Edwards finished eighth. Kurt Busch qualified second but went into an early spin and finished 35th.
Johnson still has a comfortable lead in standings, although Edwards closed the gap at the top from 51 points to 31. Johnson had a chance at his fourth victory of the year before scraping the wall late.