fewest points allowed per game season 1966 to 1979
quarterback qbr in nfl last 4 seasons with at least 1000 pass attempts
merlit kelly
fewest points allowed per game season super bowl era
best win percentage in nfl from 1991 to 1996
worst quarterback qbr in nfl history through 4 seasons with at least 1000 pass attempts
best win percentage in nfl from 1992 to 1996
baker mayfield and peyton manning first 4 seasons
best win percentage in nfl from 1992 to 1995
worst player qbr in nfl history through 4 seasons with at least 1000 pass attempts
best win percentage in nfl from 1976 to 1985
best win percentage in nfl from 1979 to 1988
worst player qbr in nfl history through 4 seasons with at least 20 starts
best win percentage in nfl from 1979 1o 1988
best win percentage in nfl from 1977 to 1996
