Sybil- I was just reading somewhere that if you run at 75% on training runs (in Ketosis) your body becomes so effecient at using energy that when you do run on race day you can carb up and get drastically better times.
I am still just trying to work my way through ketosis.

I have only done up to 9 miles in this LC state- I did a run/ walk not run only as I am just getting back into running. I actually should not be attempting to go that far just yet- but you know how it is with runners.
Anyway- I have another 50lbs of weight loss- so it will be interesting to see how I run with less fat (less fuel per say) and also when I am lighter, my fuel needs will be less-We shall see-