When I parked this evening, I had completely run out my 11, my 14 and my 70 hour clocks - all at the exact same time.

nope, not me

Gee. I thought you ran on the 11 until you ran out of them, then started on the 14, and when you ran out of them, started on the 70....:lol:

I honestly don't remember if I ever had that happen.

You could say that sort of happened to me a few years ago when I was driving.
Except I got the given load from Cedar Rapids to Phoenix by having hours drop off everytime 24 hours passed.
Run down to 0 from 11 remaining on day one, sit for the next day to roll by and gain 12,. etc

I've ran out of my 11 more times than I care to remember. I've gotten over my 70 a few times as well. I don't think I've ever ran out on all 3 at the same time.