For all the complexity of professional football, there is one exceedingly simple statistic that 49ers coach Mike Nolan believes will be reflective of whether his team has a good season or a bad one.

If the 49ers run the ball six out of 10 plays when they are on offense, they’ll be doing well. If it’s a 50-50 split—or worse—they’ll be in trouble.

“I would like to think by season’s end, if things have gone correctly, we’ll be 60-40,” Nolan said Wednesday as the 49ers began preparing in earnest for Sunday’s season opener at Arizona. “If we’re 50-50, in my opinion, that means either we’ve had injury or we haven’t won as many as we’d like because then we’re having to put the ball in the air a little bit more.”

[49ers look for ground support] – Contra Costa Times