I did spares rib today, but came up with a nagging question. All variables were the same - here were the results: MES 30 generation 2 Bottom shelf temperature: 260 -270 ( figured it was due to proximity of coils and heating cylinder. Next to bottom rack: 230 - 239 Second from the top rack: 223 - 232 Top rack: 219 - 228 I can understand that the closer to the top, the lower the temperature due to the open vent (but on the other hand heat rises). I'm just wondering which rack do I rely on to gauge the actual internal temperature? Leaving out the bottom rack, I'm still looking at a difference of over 10 degrees. Where do the pros (meaning the MES posters) position their Mavericks?