It depends from district office to district office (not so much State to State). Then they are about two months or more old news, so things might have changed if it is a district offices which is either experiencing a speed up or slow down. Furthermore, when a district office is meeting the USCIS established target for that kind of application (which is 6 months for N-400) then they will only post this information, even if they are processing at an average of 4 or 5 months they will still post 6 months for the processing time. Bottom line, the fastest processing times you are going to see at the USCIS website are going to say 6 months. The only way of getting more clarity beyond that is by checking bulletin boards like this one.
By the way, may I ask which district office you belong to? Perhaps there is already a tracking thread for that district office. Long time back I used to collect statistics about processing times across district offices. I remember that New Orleans used to be one of the slowest, but there were about four or five big offenders. Most others were alright. San Jose was pretty slow but eventually they've got their processing times under the 6 months target.
To sum up. If your district office shows processing times of 11 months you should probably believe this number, but it is probably going to be better than that by the time you apply, as most offices are speeding up to reach the 6 months target. Furthermore, the USCIS processing times might reflect a few older cases that got stuck. In general I would say go by the experiences of people on this board as a better indication.