The New England Patriots have the best win percent since 2011, with a 3 season average winning percentage of .771.
New England Patriots
New York Giants!!!
According to today's Baltimore Sun, "The Steelers have the best home winning percentage (.722) in the NFL since 1970." http://www.baltimoresun.com/sports/football/bal-ravensscout0928,0,734965.htmlstory Must be a steelers fan since he doesn't include the year 66,67,68,69 in which the Steelers were terrible. Include those numbers and the steelers do not have the best home winning percentage. Since 1966 the Kansas City Chiefs have the best winning percentage followed by the Packers.
The University of Notre Dame has the highest winning percentage during that time. They have had 875 wins, 305 losses and 42 ties.
New York Yankees.
I believe that would be the Detroit Tigers with a 47-20 record (.702 winning percentage through Sept 28th) since the all star break!
Ben Roethlisberger (Pittsburgh Steelers) has the best winning percentage by far.
Highest Winning Percentage, Regular Season Miami Dolphins .580 Highest Winning Percentage, Overall Dallas Cowboys .577
Boise State has the best with a record of 112-17 for an .868 winning percentage. After that is Texas (110-19) and Oklahoma (110-24).
In addition to the most wins, 560, Oklahoma also has the best winning percentage, at .74835.