I am very sorry Jr. I have been very busy helping my grandmother and job interviews. I promised you and I fully intend to deliver.
I've had my tewa to low 40s and was fine. However I have a high metabolism meaning I give of a lot of heat and sleep warm where others might be cold. However I promised you I would test it's lower limits, and for my sake I want to know too.
With that said, I really think you will be happy with the purchase. It's not a quilt I would use below freezing without help from a pad (except for the purposes of testing). But it is very well constructed and very lightweight. Go for the one ounce over stuff like I did.
We are experiencing a Nor'Eastern right now and if the high winds knock down those widow makers in my backyard I will do a full test right away. That's been part of the problem...I live in city/suburban sprawl and the nearest park is over an hours drive.
But I am good on my word!