Zach,
There are a large number of fuels.
Canister:~200000 (petroleum/manufactured)
WG/Car Unleaded/Kero: ~19500-20000BTU (all petroleum products)
Esbit: ~13000BTU (manufactured)
Ethanol: ~12000BTU (natural/distilled)
Methanol: ~9500BTU (Yellow HEET, petroleum byproducts)
As you can see, alky is not the best for weight/BTU. Canisters add the weight of the can and recycle problems. WG, et al, can be carried in a plastic soda bottle but requires a heavy stove, offsetting it’s advantage on short,ie <five to seven day, trips. Esbit burns a bit sooty and smelly (formaldehyde?) Good ethanol is taxed as a liquor in the USA. Methanol has the most weight for heat produced.
Going for a 3-5min burn with alcohol will reduce efficiency. With all fuels, as a general rule, the faster you burn, the more heat is lost to the outside air. Boiling with slightly more than 1/2oz ethanol, a 9-11 minute boil for 2 cups@around 34F(ice water) to 210F is, all around, the best, with the Caldera Cone burning best around 11-13min (because it traps exhaust heat, offsetting heat losses.) (40-50 test runs. All consistently between 9-11min. I used a grease pot (Stanco) with heat exchanger and lid for all test runs with a variety of stoves. https://www.shcsupply.com/products/grease-strainer-cup-lid%7C758464.html)
The 12/10 stove burns hotter than that. It WILL consistently boil 2 cups in ~5min using 5/8-3/4oz ethanol. But that stove does require “blooming.”
IFF you change parameters, you change efficiency (fuel consumption is usually used for comparisons, but time is also used.)
WG works well in a BrassLite Stove. It does produce some soot but the chimney design keeps 3/8oz fuel from boiling over. More will ruin the stove, however. Keeping to ~3/8oz fuel, it WILL boil 2 cups water in 5 min.