Yes and No.
I start with a Lump Charcoal to get the pit to temp. I find when I use Lump, it burns hotter and is able to heat up the metal faster and get me to temp quicker. When I use Kingsford, it takes me a lot longer.
After the pit is at temp, I use all wood from there. I use a log about every hour to hour & a half and it holds temp amazingly well.
We are going to really put my Custom Diamondplate unit to the test these next two weeks. We will be cooking almost 2000 pounds of food on it for our next two events and I will try to take lots of pictures and provide a recap on it's performance. Certainly looking forward to it..