Spiller is averaging almost 4.5 ypc with the limited touches he is getting. If you feed him the ball 20+ times in a game, he will break at least 1 and he would be one of the best backs in the league (if you gave him 20+ carries per game). I truly believe that.
But, when they are only giving him 3-4 carries a game, there is no chance for him to get a feel for the game and get into a rhythm. I guarantee you if you gave it to him 20 times, he would be well over 100 yards just about every time.
So, yeah.....to answer your question......give him the ball 20+ times in a game and he will be the RB we all know he can be.