I live at 5,000 feet and drive up to 8,000 feet to go skiing regularly. While I haven't driven the V-8 at this altitude, i have driven my SCV6 LR4 at sea level and up to 9,000 feet. I also compare it to my 320 hp NA V6 Infiniti g35xS at altitude vs sea-level. The infiniti is almost a ton...