i just noticed that Operating Altitude bit too on the EG4 6500, WTH? so most of utah, colorado, and new mexico are out of luck plus half of AZ and anyone living in real mountains? in albuquerque i've never once heard about any kind of electronic issues. there is no issue with living at 5000-6000 feet other than boiling water and baking taking a bit longer and don't try running up a hill until you've been here a couple of weeks.