Some additional info. I ran some more tests using the hpijs driver and duplex printing on a Photosmart 6510, and there is still a 5mm clip of the top margin on when duplex printing a test pdf file using evince. This occurs irrespective of whether "Shrink to printable area" or "Fit to printable area" is set in the page handling options. I have attached the test file for info.
Some additional info. I ran some more tests using the hpijs driver and duplex printing on a Photosmart 6510, and there is still a 5mm clip of the top margin on when duplex printing a test pdf file using evince. This occurs irrespective of whether "Shrink to printable area" or "Fit to printable area" is set in the page handling options. I have attached the test file for info.