This premium Isopro Canister Fuel 8oz, an 80/20 blend of isobutane and propane pioneered by MSR, boosts the performance of canister stoves. It outperforms standard butane/propane mixtures and burns clean to reduce soot and clogs.
Light, convenient, and better at altitude than off-brand fuel I've tried. Our local Army Surpluss store carries these relatively cheap. I've gotten 8-10 quart boils with my Pocket Rocket on a 4 oz can.