yes, in College Football. In the NFL sack yardage is taken away from the team passing total. It has no affect on rushing yards.
Yes, sacks count against rushing stats.
When Merlin Olsen played, sacks were not an official stat. He is unofficially credited with 94 quarterback sacks.
A sack is when a quarterback is tackled for a loss of yardage.
Jay Culter of Chicago bears
its where the qb is sacked but if he fumbles it its where the line of scrimage is If there is no fumble, hence no turnover, then the negative yardage is where the quarterback is officially tackled. On a fumble and turnover and downed recovery by the other team, I believe that the negative yardage would then be calculated from the line of scrimmage to where the opponent recovers.
MICHAEL STRAHAN 2001 Season with 22.5 Sacks