Door thermo is almost always cooler than grate cause it's farther away from heat source unless you have a jambo (which works a little differently). Get a stoker, guru, or even a Maverick. They'll make your life a lot easier.
Originally Posted by pull_my_butt
I was using an oven thermometer on the grill grate right in front of the opening were the coal box attaches to the cooking area. The thermometer that came w/ the grill reads approx. 50 degrees cooler than the oven thermometer I put right inside the grill. I probably wasn't at 350 very often. I sure of it.