PdfGenerator scales by 133% (or 1/3)

I'm having issues with getting a page designed to fit on 8.5x11 Letter paper to size/position properly. So I just do a simple html with a div with a set height and width as a sanity check. First I did "width: 1in; height: 2in;" and the resulting div on the PDF was 1.33333 inches x 2.66666 inches. So I tried points of 72pt x 144pt, and the same thing. If I do 54pt x 108pt I get a box that is 1inx2in. So I have to specify sized that are 3/4 the size I really want in order to get the actual on page size I'm looking for apparently.

Is there some scaling going on that you can control? Do I need to do some reset on the body? What is the user.css that it uses. I wasn't able to find these things in the source code.

Here is the simple html I'm testing:

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Anyone have any thoughts on this?