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car engine high altitude - google
www.wildsafe.org/resources/outdoor-safety-101/altitude-safety-101/high-altitude-oxygen-levels/
sea level.
"Altitude (feet) Altitude (meters) Effective Oxygen % Altitude Category Example
0 ft 0 m 20.9 % Low Boston, MA
1,000 ft 305 m 20.1 % Low
2,000 ft 610 m 19.4 % Low
3,000 ft 914 m 18.6 % Medium
4,000 ft 1,219 m 17.9 % Medium
5,000 ft 1,524 m 17.3 % Medium Boulder, CO
6,000 ft 1,829 m 16.6 % Medium Mt. Washington
7,000 ft 2,134 m 16.0 % Medium
8,000 ft 2,438 m 15.4 % High Aspen, CO
9,000 ft 2,743 m 14.8 % High
10,000 ft 3,048 m 14.3 % High
11,000 ft 3,353 m 13.7 % High Mt. Phillips
12,000 ft 3,658 m 13.2 % High Mt. Baldy
13,000 ft 3,962 m 12.7 % Very High
14,000 ft 4,267 m 12.3 % Very High Pikes Peak
15,000 ft 4,572 m 11.8 % Very High
16,000 ft 4,877 m 11.4 % Very High Mont Blanc
17,000 ft 5,182 m 11.0 % Very High
18,000 ft 5,486 m 10.5 % Extreme
19,000 ft 5,791 m 10.1 % Extreme Kilimanjaro
20,000 ft 6,096 m 9.7 % Extreme Denali
21,000 ft 6,401 m 9.4 % Extreme
22,000 ft 6,706 m 9.0 % Extreme
23,000 ft 7,010 m 8.7 % Extreme Aconcagua
24,000 ft 7,315 m 8.4 % Extreme
25,000 ft 7,620 m 8.1 % Extreme
26,000 ft 7,925 m 7.8 % Ultra
27,000 ft 8,230 m 7.5 % Ultra
28,000 ft 8,534 m 7.2 % Ultra K2
29,000 ft 8,839 m 6.9 % Ultra Everest"