Kathleen, yes, you are reading my chart correctly(although I made a numerical error and just updated the chart). The Snowpeak line would cross the alcohol line if I could get enough burns from a 100gram canister. But at 12 g/burn I can't.
Alan, thank you for noticing my numbers were low; they were for starting weight including a dry canister using algebra.. I actually placed the setups on the scale with a full canister and corrected the numbers. The alcohol setup includes the weight of the same Trek900 pot and caldera used in the canister setup. These are both about the same capacity as the Jetboil. To neglect the pot in these two setups would make the Jetboil seem even heavier. As it is, the canister or alcohol are lighter for short trips.
I'd like to update the chart to calculate total gram-days. Although as Ben says, convenience is also important; If Im rushing out the door to the crag or something I usually grab the Jetboil setup.
Question please? I understand the big steps in your graph, having to carry another canister, but what accounts for the small steps?