1976 Steelers were actually the best ever only 28 points given up in the last 9 games of the season with 5 shutouts and a 9-0 record. I bought up the 1977 Falcons because most people don't know about them. Statsitically though the 1977 Falcons have the best numbers at only 9.2 per game, and they scored 12.8 per game so they did score 50 more points than they gave up all season. Especially with those names, a bunch of players that few people would recognize it is an impressive accomplishment.