I'm starting my interval training this week, and will use some of the other info here....not necessarily the weight though I'l continue my usual regimen. This weekend, we stayed at 9300 feet and I rode up to ~11,000. I did around 65 miles and 4,750 feet. I found that this is basically my max at altitude...I was hurting during the last 10 miles. I'm hoping the info in this thread will help me prepare for my long ride at altitude (8,500-12,000)- 80 miles and 6,500 ft of climbing in early Aug. Right now, I doubt I could finish it without it becoming a survival type ride during the last 30 miles.