Yes, we use 91 here, like California and Arizona, instead of other parts of the country that use higher octane for their premium fuel (92 and 93). You are probably not noticing an issue due to the elevation.
I personally run the CA 91 Map, just to be on the safe side.
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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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