I also had one girl get within in inch or so of my 8.5". She had obviously been practicing on a cucumber or something, because she seemed proud of her talents, and her boyfriend was of admittedly average endowment.
She also was very fond of the book, "Guide to Getting It On," and once showed me the section on deep-throating. Definitely hook-up with any girl who has a copy of this excellent book.
Even with this girl though, she couldn't substain the deep throat for more than a second. She had an unique technique where she would start from above my cock and concsiously move her head down in one quick movement and swallow my cock. Immediately I would feel her gag reflex on my cock and she would pull up before puking. She was doing it just to see if she could. I think she had been waiting for a cock big enough to test her. But ultimately I won. lol. If I had only been 7" she would have had it though---nose to the pubic bone. Gotta hand it to her.