I think you are talking about the Coleman Powermax Fuel. I have a few lanterns and a stove that runs on it. It’s a good fuel that works well all times of the year. Butane doesn’t work well when it’s very cold (snowy winter temps) and propane is under 125-pounds of pressure making it necessary to have a heavy cylinder to contain it. Coleman gets around these 2 problems by making a blended fuel that incorporates attributes of both fuels.

Having used my stove and lanterns in the winter down to 20-deg, I can attest to the fact the stove and lantern works just as well as in the summer.