Did a little more testing today. At higher temps, it's off more. At 350F it averages 357F. At 450F, it averages 438F. It was a bread recipe at 450F that caused me enough frustration to do this testing. Doing a loaf now with the oven set at 465F to see if that 15F difference makes much difference.
Also found it interesting that a giant 30-pound baking steel doesn't do much to level out the temp variation. Though I've never tested this temp without the steel. Maybe it does.
