A PLUQ will keep you warm down into the fifties, no problem. Personally, I'd carry either a fleece throw or another poncho liner for a top quilt under the expected temps.
I agree with both MAD777 and Tendertoe that you should prep for temps to be ten degrees cooler than expected (as well as temps ten degrees warmer than expected, as far as water carried, but that's another thread). Having that fudge factor in your gear means that a trip that would be highly uncomfortable otherwise is now "just right".
At most, a poncho liner is going to set you back a pound over and above a sheet. A fleece top quilt maybe a little less. Either way, if the temperatures decide to drop unexpectedly, you'll be good to go.
And, at most, you'll be at 21 lbs instead of 20. To me, that's worth it. To you? I dunno.
Bookmarks