After running three fridges side-by-side, I picked the one that ran the
coolest on propane, cleaned the burner well, and installed it in my van. It
was cooling 40 degrees below ambient. I also installed a new propane tank
yesterday, and the fridge was cooling exceptionally well (empty) at 40-45
below ambient. Then, last evening it began to cool less, like 30 degree
difference. I first checked the regulator and readjusted to 11" W.C., very
slight improvement if any. The fan on the fins comes on occasionally, there
is an ice film where the ice-trays go, the door seals well, but I can only
get 45 degrees (measured digitally about 2" in front of the cooling fins) at
75~80 ambient. Am I expecting too much, or is there something else I am
missing here? Thanks in advance for any input!

Karl