So I recently got a Oklahoma Joe Longhorn and did the following mods to it: gasket tape around the firebox door and main cooking chamber door. reduced smoke escape by 98%. There is still some escape b/c the door isnt heavy enough to put more pressure now that the is some tape on the edges. Fixable by putting some weights on it. added high-heat sealant to the all joints around the firebox and around the chimney. Reduced smoke escape by 100%. added 90" angled tube to the inside of the chimney to bring the vent down to the grate level. raised the level of the fire box grate by 3" to give more room for ash. build a 12"x12"x12" charcoal box out of mesh steel. I did my first smoke on it yesterday, 10lbs full packer brisket and here is what i noticed. started with full basket of kingsford charcoal briquettes (around 5lbs). i monitored temp at grate level right in front of the brisket. could not maintain 250F for more than 1 hour without having to add more charcoal. - When needed to add more, I would light up a chimney full and add it to the firebox when its starting to get white. I did this pretty every 90 mins over 10 hours. temps fluctuated from 220 to 260 for the entire cool. I cleaned out the ash once i saw it was getting to be too much. did this 2-3 times during the day. I ended up using around 25lbs of charcoal and around 3lbs of cherry wood chunks for the entire cook. For those with offsets like mine of similar size, are you using this much charcoal? Is this normal? Not sure what else I could do to optimize charcoal usage.