1) 8.5" x 11" (93.5 square inches) sheet Coated Paper - 100K impressions Solid Coverage will use 30 pounds. 2) 8.5" x 11" (93.5 square inches) Offset Paper will use 45 pounds.
Sustainable Printing Goes Far Beyond Using FSC Certified or Recycled Paper
This informative paper on deinking: demand, principles, problems and solutions also explains why printing technologies are not all equally compatible with paper recycling systems; and why just a small fraction of printed material in the paper can cause difficulties.
Link To White Paper