Why is my calculated file size incorrect depending on bitrate?

Hi,
I have created a sequence in PPro CS4. It is HD 1920 x 1080 - probably interlaced as it came from a Sony SR10 PAL camera.
The sequence is 7 minutes long.
When I encode it using Media Encoder CS4, I have set it to H264 and TS multiplex. When I set the constant/ variable bitrate to 11 Mbps, the final file is around 1600MB, at 1920 x 1080i.
In my opinion, a 11Mbps video file, which is 7 minutes should be around 580MB. (7m x 60s x 11Mbps / 8bits)
What is going on?

Don't forget to calculate your Audio too.
Good luck,
Hunt

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Patrick,
After I installed and registered my software, I received this email twice for both Premiere Pro and Encore, and I would imagine that it would only make sense to receive this same type of bonus for Production Premium:
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Adobe Systems Incorporated [[email protected]]
Thank you for purchasing and registering your copy of Adobe Premiere Pro CS3. You now have a wealth of creative tools at your disposal. While taking advantage of online and printed resources we also encourage you to select a complimentary benefit. At Adobe we want you to get the most out of your software it's our commitment to you.
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Hypatia Sans Font:
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Lynda.com Training:
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Classroom in a Book® Series:
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