Apparently I can't use savetrees with lualatex - is there another way to expand the writable area to the whole page (for US-letter currently, I think other people are interested in A4)?
I get this error message:
! Package microtype Error: The `tracking' feature doesn't currently work (microtype) with luatex.
savetrees(mine is: v2.0, dated 2011/05/14) should work withluatex; if you have found a bug, then it should be reported (or perhaps asked here if you are unsure). – jon Dec 10 '12 at 20:27