According to the Pro Football Hall of Fame, as of the start of the 2007 season the team with the best all time regular season winning percentage was the Miami Dolphins whose all time regular season record was 368-252-4 for a winning percentage of .593. Second was the Chicago Bears with an all time regular season record of 670-482-42 for a winning percentage of .579.
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∙ 2007-11-12 20:29:47Highest Winning Percentage, Regular Season Miami Dolphins .580 Highest Winning Percentage, Overall Dallas Cowboys .577
The Lions best regular season winning percentage came in 1953 when they had a record of 10-2 for a winning percentage of .833. The most wins the Lions had in a regular season came in 1991 when they went 12-4.
Dallas Cowboys
Through the 2007 season, the American League team with the most wins in a regular season was the 2001 Seattle Mariners with 116. The American League team with the best winning percentage in a regular season is the 1954 Cleveland Indians who went 111-43 for a winning percentage of .721. Seattle's record in 2001 was 116-46 for a winning percentage of .716.
As of the start of the 2008 season, the best franchise regular season winning percentage is .580 for the Miami Dolphins (369-267-4). The Dallas Cowboys are second at .578 (414-302-6).
As of the start of the 2010 season, the Cowboys have leapfrogged the Miami Dolphins. The Dolphins have a win percentage of .579 and the Cowboys have a .580 percentage.
The top winning percentage of the 1980s in the NFL was the San Francisco 49ers. They won 68.4% of their regular season games. 2nd was the Washington Redskins at 63.8%.
As of the end of the 2012 season, the Chicago Bears have the best all time regular season win % of .578
The Tigers best winning percentage for a regular season came in 1934 when they went 101-53 for a .656 winning percentage. They won the AL pennant but lost to the St. Louis Cardinals in the World Series. The most wins the Tigers had in a regular season is 104 in 1984. They won the AL pennant and defeated the San Diego Padres in the World Series.
The 1906 Chicago Cubs have the best winning percentage for a season with .763. The Cubs 1906 record was 116-36.
That would be the 1906 Chicago Cubs with a regular season record of 116-36 for a winning percentage of .763.
The franchise's best winning percentage for a season is .623 and has been accomplished in three seasons. The 1886 Quakers had a record of 71-43 and both the 1976 and 1977 Phillies had a record of 101-61. The 1976 and 1977 teams are the only two teams in Phillies history to win 100+ games in the regular season.The franchise has had two other teams to finish with a winning percentage of .600 or better. The 1899 Phillies had a record of 94-58 for a winning percentage of .618 and the 1887 Quakers had a record of 75-48 for a winning percentage of .610.