Hi
Dreaded four season ratings

Could mean a 80/20 rating or something else. Much prefer the percentage of the mixture be stated. Never got to the bottom of gas mixture issue re what actually happens. Some things I have read indicates that the low temperature gas burns off first and the cheaper gas then does not burn well afterwards so performance drops once a cylinder is say half full. Experience suggests that above -5 a sensible mixture should work ok, just use more gas and take longer. For extreme conditions the liquid fuel stoves are the go. I use a Primus Eta that can run on all petroleum based fuels and gas. On liquid fuel it does not simmer well but cold has no effect. The only liquid fuel stove that I found that can simmer is a Optimus Nova. The preheat design of the Primus means even in snow I did not get a performance hit that I noticed with a sit on top last weekend. A Moonwalker Ti would be tempting but not cheap if I was a snow bunny. I have the Primus ETA for extreme conditions but frankly I am unlikely to be out in them so more overkill than practical need for me. Actually I got it because it is a stable cooking platform. The Trangi I once used made a rock solid platform and with the sit on top more than one meal has hit the dust.
Depending on the circumstances I tend to use the Primus Eta with 2.1 litre pot and have a GSI frypan with folding lid. This means I can steam vegetables in the Primus pot and put them in the heat retaining bag and pan fry steak, Salmon, etc in the frypan much as at home. The GSI frypan is around 500 grams but beats hands down any system that uses the lid of a pot set. Also means omelettes are safely made. Bacon and eggs will keep well in Tassie's cooler weather for a slap up breakfast.
For lighter trips I use a Optimus Crux or Kove Ti and a Snowpeak titanium cookset. Favourite meal is frying off the salami in the lid to brain off the fat and then adding it to a packaged tomato pasta dried meal with dried peas going in first with the cold water and then brought to the boil with the packaged pasta added then when nearing finished by adding the salami.
Generally I go for a deluxe meal on day one and good breakfasts of omelettes or bacon and eggs which works well for overnight or even three nigh twalks. After that weight would decided a more traditional style approach. Sadly the package tuna steaks disappeared off local supermarket shelves as they were great for a decent meal late into a trip.
Cheers Brett
"lt only took six years. From now on, l´ll write two letters a week instead of one."
(Shawshank Redemption)