Mountain View, CA on Blast tier (which has historically been 30000/5000, but now appears to be 50000/10000). Results are shown in this thread post:
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Re: Comcast new speed?Edit: received mail from Comcast on the morning of 03/27. Contents are below.
From: XFINITY <xfinity@emails.xfinity.com>
To: {removed}
Date: Wed, 27 Mar 2013 05:04:14 -0700
Reply-To: XFINITY <reply@emails.xfinity.com>
Subject: Service Announcement
We've increased your speed!
Dear Valued Customer,
Great news! We've increased your Internet speed!
Now we have doubled the speed of your Blast!® Internet service, with download
speeds up to 50 Mbps and upload speeds up to 10 Mbps.
What does this mean for you? You now have more speed so everyone can get online
and do more on their devices all at the same time. Stream HD movies and TV
shows, download music and game online - all at faster speeds. It's just another
way we're continuing to keep you connected to the people and entertainment you
care about.
Sincerely,
Comcast