Day trips the tabs are fine in a drilled Tuna can for a wind break. You can boil water with a full tab if you have a pot with a generous amount of bottom surface area. But they just don't cut it in really cold weather. It is nice to have a few on hand for emergency fire starter on the wet side. I've built a few alcohol stoves and will toss one in the day pack once in a while. They work, but the fine tuning is a PITA. The stove is light as heck, but I'd still take 6oz. of fuel with me. I've got a Pocket Rocket now for anything overnight that is so much more convenient. I love the JetBoil system, but the weight and size is a turn off.
The Snow Peak Hybrid Ti cookset with Ti spork (8oz.) gives you a polymer bowl, cook pot and a pan/plate that doubles as a lid to the pot. -Which retains more heat when boiling and reduces boil time by nearly 1/3. The pocket rocket (3oz.) fits inside the cookset. If I use a piece of foil, rocks, my pack or other 'something' as a wind break, making sure to use the pan as a lid every time I boil water, then the amount of fuel is reduced. A 4oz. canister lasts quite well. I can leave the polymer bowl home and save a couple ounces.
I might have gotten a little off track huh...? What I'm trying to point out is that the weight difference isn't everything, and if you put a lid on your boil pot and use a wind break, you'll likely have a better experience boiling water with any type of stove/fuel.
-Steve