Just a quick note from here in Flagstaff. I did the classic R2R2R route (Kaibab Trail on both Rims) today completely solo in 7:16:54. I'd been bandying about the idea of going after Dave's year-old FKT of 6:59:56 for the past week, but with 180 miles in the 7 days before today and with 12 hours of solo driving yesterday I clearly wasn't thinking about it that seriously.
In any case, I gave it a solid effort today, but a lack of calories and electrolytes (not to mention long runs and just consistent running in general, having only been truly healthy for the past 5 weeks or so) did me in and I bonked in a big way coming back up South Kaibab. This is not unusual when one attempts this run. I'll post a more in-depth report of the run later.