You asked: "How does the fuel efficiency of your stove compare to some of the other alcohol stoves reviewed a few months back?"
This is a can of worms. :) The short answer is that my stove is very efficient (it's not really mine, I'm just partial to it and developed a way to make one that turns out real nice). I can cook (not just boil) most meals for myself and a companion with 1 fl. oz. of fuel, which is how I estimate how much fuel I need to carry.
To say how my stove compares to the others we tested is hard to do. Will tested those other stoves as they came from the manufacturer, with the manufacturer’s supplied windscreen and accessories. Although my stove may be similar to the OutdoorEquipmentSupplier 12-jet stove (which had slightly better than average efficiency) you can't just compare the stove. The windscreen, pot support (height), pot size, pot shape, pot color, number of jets, etc. must be considered as all of these affect how heat is transferred to your food. Homemade alcohol stoves are plagued with variables. A different windscreen or a few more jets may make all the difference in the world. Part of the fun is tweaking the variables to balance boil times with fuel efficiency for your particular setup.
You asked: "Have you ever tried making a stove with smaller cans (V8, energy drinks, etc)?"
I haven't, but would expect the same step-by-steps to work for any size can as long as the cans used were the same size. I never made a smaller one because the standard size weigh so little as it is; dropping weight off of a 0.4 oz fully capable stove has never made it to the top of my priority list. With that said, Carol's recent super ultralight challange has got me thinking about it.