David Johnson 66.75
Ezekiel Elliot 70.8
My point was not that Peterson was great, but people talk about his fumbles and he's not historically bad or anything. He did have three years that were particularly bad. Those three years accounted for 24 of his 39 career fumbles.
According to this Peterson has the 35th most fumbles for a RB. I did count Frank Gifford as a RB, but it is possible one of these older guys was a RB that I just didn't know, so maybe I missed a guy or two.
Obviously most of these players have had very long successful careers, that is kind of a prerequisite to getting enough touches to make this list.
I have Peterson with 2781 career touches (including playoffs) and 42 fumbles. One every 66 touches.for his career.
In the playoffs Peterson has 122 touches and 3 fumbles. One every 41 touches in that situation.
It isn't just the fumbles but the timing of them. He has fumbled 3 times in 5 playoff games costing the team an opportunity to advance to the Super Bowl in 2009 and to advance past the wild card round in 2015.
He did seem to correct his fumbling issues for a time (after losing a lot of them in the time frame you mention) but then he had almost all of the 2014 away from football and the fumbling showed up again in the 2015 playoff game against the Seahawks, which did cost them that game. In 2016 when he came back (briefly) from his injury, he wasn't doing that well, then he has a good run but fumbles at the end of it. Then he shuts himself down again for the rest of the year.
It shows that the work he put in to improve ball security has slipped again, in part I think that is because of all the time away from practice. Part of it is just a lack of focus and situational awareness on Petersons part. The fumble against Seattle for example, he had the first down, but he is fighting for extra yards and allows a defender to strip out the ball while he is. It isn't smart football.
That he did improve in this area with focus and practice is a good sign. For all the talk by Peterson about becoming more involved as a receiver and improving his pass protection, those things have not come to fruition from his hard work. The fumbles was a more positive thing that he did improve on that for awhile.