How did Johnson end up ahead of Wallace?

been asked this quite a bit today, after #48-Jimmie Johnson got together with #23-Kenny Wallace towards the end of the race, Johnson spun and lost the lead draft and Wallace continued on, BUT Wallace ran out of fuel a few hundred feet after the incident with Johnson and finished 17th, Johnson finished 15th.( Speed Channel’s Inside Winston Cup – Kenny Wallace, also the #77 crew chief, Bootie Barker is the hot seat guest this week)(4-7-2003)