A few weeks ago I used my prolite 3 for 5 nights at elevations ranging from 4800 to 6200, temperatures in the upper 30's and low 40's. I used a 30 degree bag, wore 2 layers, and used a GG thinlight under my prolite 3 short. I was cold! Every time I scrooched my rumposo a little, I'd feel a surge of cold until my body heat warmed everything back up. On the next trip I tried the GG torso nightlight or whatever, with the GG thinlight underneath. Same bag, same conditions. I was much warmer, but not so comfortable. So my new plan is to use the BA insulated pad (I was lucky to get a prototype 48" one) with the GG thinlight. That way I'll get both the insulation from the closed cell foam pad and the comfort, without cold absorption, from the inflated pad. Fussy, fussy, fussy...
Oh, wait. We're supposed to be talking about accuracy of weight. The BA 48" weighs 12 oz. Nothing to compare it to, though, since it's not in their line of pads for sale, although it should be.