In reply to Sir Stefan:
> Is the only difference between Primus Winter Gas and Primus Power Gas the blotting paper insert? I'd be thrilled to see more evidence on how much better that new system is.
Difficult to say. Primus subtly hint that the Propane:Isobutane ratio is different in their Winter Gas
http://www.primus.eu/knowhow/primus-gas (typically winter gases use more propane because it evaporates at lower temperatures, see:
http://goo.gl/MZcJfM). And as Primus say, you need the right gas for the conditions, the paper insert might make you burn through your canister faster in summer. More testing needed!