I budget about 3/4 oz of alchol to bring 2 cups of water to boil with my penny stove. I've used the supercat and liked it but found it used a little more fuel and was a little less wind resistant.

I generally carry 2 ounces of alcohol per trip day to allow for a hot breakfast with coffee and a hot dinner with tea.

If you are talking about maximum weight, a canister stove (my snow peak) becomes lighter for me after about 6 person days doing the above. (if you are talking about average weight over the trip the alcohol stove may remain lighter.. I don't care about that because I usually care about my pack at it's heaviest...)