Jeff, Yes, pretty much.
WG and canister fuel have about the same energy density.
Alcohol has far less.
I usually use a balance of around 20,500 BTU/lb when checking this. WG has around 19,500 per pound (note that it is mostly pentane, hexane, heptane.) Similar.
Alcohol has about 11,000 average (blend of ethanol, methanol.) On long trips in winter, it makes no sense to use alcohol, especialy for group cooking. There just ain't enough heat in the fuel.
However, you cannot have canister gas without a canister. These weigh about 30-40% of the fuel weight, much reducing the fuel overall density. The same applies to WG, of course, but you can carry WG in a 1 ounce container(6,8,10,12,16, 20 or 24oz, or 1 liter & 2 liter) soda bottle for anything up to 69-70 fluid ounces. Note that canisters are already in mass weights. WG is not and WG is in FLUID ounces. Mass/density is close to .78 that of water so to carry 12floz of WG fuel, we multiply by .78 to get 9.36oz of weight. With a 1oz fuel bottle we get around 10.36oz in weight. This is for roughly 11407 BTU's in fuel.
12oz soda bottle: 1oz
12 floz of WG: 9.36oz
Fuel efficiency: 11407BTU/10.5oz or 1086BTU/oz
For canisters we get a total weight of around 220g + can = 308g or about 11oz for roughly 10067 BTU's in fuel.
Can: 88g (3.14oz)
Fuel: 220g (7.86oz)
Fuel efficiency: 10071BTU/11oz or 916BTU/oz
Clearly, based on fuel, the WG is superior to take. However, for shorter trips, smaller groups (ie, less fuel used,) you consider the weight of the stove. WG stoves, are heavier, on average, than canister stoves. Usually offsetting the weight of the fuel. So, this is why canisters are so popular, even though they are less efficient, fuel wise. In the above, Ryan was trying to decide on the best performing stove for winter group use, but this can vary based on all the criteria he mentions, eg pot size, wind, etc and the base BTU efficiency of each stove.