Originally Posted by BLACKSMOKE
Efficiency is as simple as a well sealed unit,unless outside temps are extremely low.
Other than that what are you trying to accomplish?
I think I understand,your UDS has the same potential for a long smoke time as any WSM because the volume of fuel is the same.
Making efficient use of that fuel is your goal
1.) load the bottom with the amount of fuel for the duration you need
2.)Arrange that fuel so it burns in a centric " C" like shape starting one end,the amount of fuel burning will depend on the temp you want(220 thinner C) Minion method
3.)Most important to burning only what you need when you need it is the Guru,it only moves forced air when temps need to be raised,when temps are good or too high the fan won't come on.
Loading the unit is a craft that will take a few runs but loading it correctly and it being sealed with a Guru will yield what your looking for every time......
Duration of burn can be reduced by low ambient temps.