Using a Power Pressure Cooker XL for high altitude canning above 6000 ft sea level I just purchased a Power Pressure Cooker XL and was planning on using it for canning. However, upon reading the owners manual, it says it is not recommended for canning over 2,000 ft sea level. I live at 6611 ft above sea level. Can I use this machine as long as I increase my cooking time by 5% per extra 1,000 feet above 2,000 ft? Or should I purchase something different to use for both home cooking &amp; canning. Thank you.
BEWARE that no electric pressure cookers have been approved for pressure canning by the USDA.  The National Center for Home Food Preservation actually put out a bulletin after manufacturers, like the Power Pressure Cooker XL, started to advertise that their cooker was USDA approved.  

It is not. 

Please do not pressure can in this, or any other electric pressure cooker.  See my pressure canning faq (Can I use my electric pressure cooker to can?) if you'd like to learn more about "why" pressure canning is not considered safe in electric pressure cookers - at any altitude.