SCVJeff wrote:
All I was basing that comment on was filling a tank and what an empty one takes on a cold day vs. warm
As long as there is still liquid propane in the tank, enough will evaporate into gaseous state to build up pressure. The head space will make no difference.
In Europe, you may run into some issues as they sometimes use a butane mixture and that can reduce pressure at low temps. They don't use those mixtures in the USA, so you have to get to extreme cold temps (beyond most winter camping situation) before propane has an issue.