Yup. There is less air up here at elevation so the Air/Fuel ratio is higher and more resistant to detonation.
EDIT: and yeah, we do use the California gas. Directly from California. So, I'd recommend to run the CA 91 map. What's 5 hp compared with potentially damaging your car.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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