Earlier in this thread, I think someone had queried just how viable a ketogenic diet would be for going fast.
I had an interesting experience on the Whitstable FNRttC at the weekend. As I wasn't TECing, nor leading the ride for a change, I got to do a lot of waymarking involving zooming around a lot, as well as partaking in the traditional 7 mile sprint for the finish to the Waterfront Cafe.
On going through my GPS data for the final stretch, which included setting off from a stop, I found I averaged 24.7 mph with a peak of 32.3 mph and found I could do with some higher gearing than 50x11. Also, I wasn't particularly out of breath (unlike everyone I'd overtaken) and felt I could easily have carried on going, which certainly wasn't the case the last time I raced that section before I went keto, when despite doing similar riding, was completely wasted before the end.
So, totally unscientific, but I certainly felt being keto has improved my top end as well as my endurance.