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bigshank Yes, it is efficient. I don't think I've used it in very cold weather yet though, so the amount of time before you need to add fuel is probably a bit reduced in the winter time. I've cooked beef brisket flats and pork butts in it this year and so far the longest cook I've had is about 8 hours and never had to add any fuel. But after I took the pork butt out I checked and there was still enough unburned coal to go quite a little while longer - once it's up to temp. it doesn't take much to keep it there. By the same token, you don't want to overshoot the temp by too much because it takes quite a while to cool it back down. I did that early on while I was still learning and got it over 100 degrees too hot and had to take the turkey breast out and wrap it, then I was pouring water down the interior surface to cool the body down. It was more than a half-hour before I could unwrap the turkey breast and put it back on to finish.