on my 2400 the letter-size when i choose my paper in "page setup" shows a 0.13 border on all 4 sides, and the borderless sheet feeder shows 0.00 border on all sides. in your instance, i would pick "sheet feeder borderlerss letter size" to get full use of the 8.5x11. theoretically though, the 0.13 should be enough without being borderless, but i would still not use it as it would be cutting it pretty close (0.07)!