Louis, the 49ers, one of four teams with more rushing attempts than passes this season, lead the NFL in rushing (168.6 yards per game), and their 5.64 yards per attempt is threatening the league record of 5.74 held by the 1963 Browns.That Cleveland team was headlined by , perhaps the greatest running back in league history, who led the Browns to the NFL championship the following year.If the 49ers realize their own championship aspirations this season, they will buck a trend in a passdriven league: A team hasn't won a Super Bowl without a 1,000yard receiver since the 2005 Steelers, and the last champion with a 1,000yard rusher was the 2007 Giants. Midway through the season, San Francisco's leading wide receiver, , is on pace for 880 yards while Gore is on pace for 1,312 yards, which would be his highest total since 2006.At 29, an age when elite NFL running backs often are shoved into supporting roles, Gore also is averaging a careerbest 5.5 yards a carry, 1.2 more than his average