OK 2 gallons seems like a lot, I agree. But in comparison of just the 2 chimneys. Jharkin states that he has a 18' tall chimney. Using the fact that 8" dia are common. 2*pi*4=25 sq in. Then 12*18=216 in. Doing the math that comes out to 5400 sq in of chimney area. While Will has a 6"x11" chimney at a height of 32 feet. The 6x11 chimney has 6+6+11+11=34, 32'*12"=384" so 34*384= 13056 sq in of surface area. This is 2.4 times as much surface area to build up on. Also the it will take longer to heat the flue up to operational temps. While I totally agree that 2 gallons is a lot, I understand where it may come from.