Rendering AVCHD files to H.264 causes file size to go up!!

Hi everyone,
I have a Sony HDR-SR11 camcorder that produces files in AVCHD format (.mts file extension). The camera natively produces file which are approx 100mb for every 1 min of video (1440x1080 setting). My issues is that when I add files to the timeline and then render them in Premiere Elements 7 using the H.264 1440x1080i format (creates a M2T file) the file size actually doubles (1 min is now approx 200mb). I'm only bringing the files into PRE 7 so I can add transitions, but I cannot afford the disk space if the program will double each videos size.
Is there a different setting I should be using to just do basic editing and not change the source quality? I know the camera adds significant compression to the file, but why would it grow in size when I render.
Any help is greatly appreciated.
Mark

Update:
If I go in the Share Tab and click the advanced button I am able to fine tune my rendering settings. I found that changing the Bitrate Settings on the video tab will allow me reduce the file size. The default settings is 21 Mbps for both target and Max, I think it is WAY higher than the Sony Camcorder does natively so that is why the file size was growing??? is this correct?
Anyways, changing the Maximum Bitrate slider to about 10.1 Mbps gave me a file size equal to the original file from the Sony camcorder. The quality looks a tad softer than the original, but it's really hard to tell.
Anyone know if this is the solution to the problem described above? And, anyone know what bitrate these Sony HD cams output normally?

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