"This is a stove similar to the Peak One expert. The Extreme however burns a little hotter (14,000 btu instead of 12,000) it therefore boils water a little faster. One thing that I have found helpful is a small insulating pad to place the fuel cartridge on in cold weather. Also as Tom suggested with the Expert a windscreen is also helpful at conserving fuel.
The Extreme uses a 10.6 oz fuel cartridge- butane and propane mix. One cartridge last for about 60mins. However I have yet to get one to last that long, usually I get about 55-58 mins out of them. The flame control is a breeze to use, and easy even in gloved hands. One major thing is its weight, only 11 oz. Compared to the Expert stove I could carry an extra 3 oz of much needed gorp."