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Stick with regular which for us is 85. Due to the altitude there is less oxygen so less potential energy to be made. Since the Denver area is a mile high we lose roughly 20% of the power the car would make at sea level.
I've got my 2LT/RS and have 1700 miles on it with mostly 85 octane and no problems. Unless you are getting pinging higher octane can cost you power.
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