I was lucky to live in Wrightwood for a year back in the 90's. Best air I've ever smelled, like vanilla most all the time.
Ken, I think there's a difference between running a race vs training for a race. These guys were training in remote wilderness with no support team when they hit their SPOT SOS button.
It seems like it would be helpful to train with a couple extra pounds anyway. Have a survival system during training runs, and then go without it on race day when you have a support team. You feel a couple pounds lighter when it counts. Winner winner, chicken dinner.