Naturally aspirated engines lose 30% power at 10,000ft
Rocky Mountain National Park's Trail Ridge Road tops out at 12,183ft. Gasoline Class A rigs (Ford F-53 chassis) lose 28-33% horsepower at that elevation. Diesel pushers lose 12-15%. The result: a rig that climbed Vail Pass in second gear at 30 mph won't get above 25 mph on Trail Ridge. Plan for half-speed and engine fatigue.


