Dog-Love
All business
"What are you afraid of, failure? So am I. "
-Shatner
If it were me, I would not run a 22 miler. I would suggest doing 20 miles at your own pace this weekend, and seeing how it goes. My first marathon, I was pretty bad about getting in the 10 or 12 milers during the week as well. Keep up those daily 6's and i'm sure you'll be fine. Do allow time for rest though, especially that first week in Oct.