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[zippoking]

From Wiki:

http://en.wikipedia.org/wiki/IEEE_802.11n-2009

40MHz in 2.4GHz
The 2.4 GHz ISM band is fairly congested. With 802.11n, there is the option to double the bandwidth per channel to 40 MHz which results in slightly more than double the data rate. However, when in 2.4 GHz enabling this option takes up to 82%[11] of the unlicensed band, which in many areas may prove to be unfeasible.

The specification calls for requiring one primary 20 MHz channel as well as a secondary adjacent channel spaced ±20 MHz away. The primary channel is used for communications with clients incapable of 40 MHz mode. When in 40 MHz mode the center frequency is actually the mean of the primary and secondary channels.

So I read this as saying it's possible to connect at 40Mhz in 2.4Ghz, but not possible if the area is congested with other 2.4Ghz broadcasts (mine is I'm sure in Chicago). 

[zippoking]

OK so for what it's worth, I think I have this figured out finally.  If you want to connect in 2.4Ghz mode @ 300Mbps, you can by selecting 40Mhz for channel width, but this is only an option for "N only".  I still can't seem to get it to connect @ 300Mbps when selecting 20/40 atuo.  When I do, it's always at 20 despite having only my one N computer connected. 

So, maybe I'm beating an almost dead and worthless horse, but can anyone figure how the router decides to use 40 in the 20/40 auto mode?  Don't say put it in 40 only mode cause I have many G clients that sometimes connect!