Regular season and playoffs
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1973 | BUF | 14 | 164 | 73 | 44.5 | 939 | 4 | 10 | 20 | 5.7 | 45.8 |
| 1974 | BUF | 15 | 258 | 130 | 50.4 | 1752 | 14 | 12 | 32 | 6.8 | 71.1 |
| 1975 | BUF | 14 | 321 | 169 | 52.6 | 2426 | 25 | 17 | 20 | 7.6 | 81.3 |
| 1976 | BUF | 7 | 151 | 74 | 49.0 | 1086 | 9 | 1 | 11 | 7.2 | 90.0 |
| 1977 | BUF | 14 | 457 | 221 | 48.4 | 2803 | 12 | 24 | 36 | 6.1 | 54.8 |
| 1978 | BUF | 16 | 330 | 175 | 53.0 | 2136 | 16 | 15 | 29 | 6.5 | 70.5 |
| 1979 | BUF | 16 | 458 | 238 | 52.0 | 3572 | 14 | 15 | 43 | 7.8 | 74.4 |
| 1980 | BUF | 17 | 468 | 266 | 56.8 | 2985 | 21 | 21 | 16 | 6.4 | 72.3 |
| 1981 | BUF | 18 | 563 | 284 | 50.4 | 4122 | 27 | 26 | 17 | 7.3 | 71.4 |
| 1982 | BUF | 9 | 264 | 144 | 54.5 | 1597 | 7 | 16 | 11 | 6.0 | 56.3 |
| 1983 | BUF | 16 | 508 | 281 | 55.3 | 2995 | 26 | 25 | 27 | 5.9 | 69.3 |
| 1984 | BUF | 12 | 344 | 191 | 55.5 | 1991 | 12 | 17 | 35 | 5.8 | 63.5 |
| 1985 | DET | 8 | 54 | 31 | 57.4 | 364 | 2 | 3 | 4 | 6.7 | 67.2 |
| 1986 | DET | 6 | 155 | 73 | 47.1 | 941 | 7 | 7 | 10 | 6.1 | 62.9 |
| 1988 | TB | 2 | 46 | 31 | 67.4 | 368 | 3 | 1 | 1 | 8.0 | 104.3 |
| 1989 | TB | 5 | 90 | 44 | 48.9 | 533 | 3 | 6 | 5 | 5.9 | 50.8 |
| 1990 | IND | 1 | 8 | 2 | 25.0 | 21 | 0 | 2 | 0 | 2.6 | 0.0 |