In the 1989 through 1996 seasons, the 49ers went 108-35. This includes the Niners’ 15 playoff games during the 8-year span. The 49ers scored 3900 points in the 143 games; the opposition scored 2329 points. This works out to an average of exactly 27.27 points per game for the 49ers, 16.3 points per game for the opposition.
In their 108 wins, the 49ers scored 3332 points, or 30.85 per game, and their opposition scored 1523 points, or 14.1 per game.
In their 35 losses, the 49ers scored 568 points, or 16.2 per game, and their opposition scored 806 points, or 23 per game.
During these years, the 49ers gave up as many as 40 points in a game once, to Philadelphia in 1994, the game that preceded the 49ers winning 13 of 14 games to close the season and win the Super Bowl. The Niners allowed 35 to 39 points four times. They scored 40+ points 23 times. They scored 50+ points in a game five times, most famously in the 1990 Super Bowl vs. Denver.
You can compare the performance of the Seifert-coached 49ers to the performance of the Walsh-coached 49ers, with the clear caveat that Seifert had the advantage of inheriting a Super Bowl winner instead of a team that had just gone 2-14 and hadn’t made the playoffs in six years.