I pick up a new bag to Texas backpacking. I was camped out up in the hill country this weekend. It didn't get colder than 45. My new bag is an REI Igneo which is rated to 19 and comfort rating about 30. I didn't get cold but I wasn't comfortably warm. The reviews on this bag are good. Most people say the rating is dead on. I figured at 45 degree I would be unzipping it but I didn't. Had a full stomach and I slept in only shorts and a t shirt. My pad is a Nemo Tenslor. Nemo doesn't give an R value but they say it will keep you warm between 20 and 30 degrees. Also I am thin. 6'4 200lbs. I have always been a cold sleeper. I have a EE Revelation that's rated to 10. I haven't been able to test it in super cold temps so I don't know how it will work but I have a Marmot Trestle 15 for car camping that has kept me comfortably warm down to 30. Has anyone else had this issue with down bags?