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the octane rating has to do with altitude as well. higher altitudes have lower octane fuel available because something that has to do with the air density and pressure affects the way the fuel wurns. in many high altitude places regular gas is 85 octane and the premium is only 89, but the way they burn, the car will recognize it as a higher octane. i saw a discussion about all this on the chevy cruze forums. the 1.4L turbo engine requires premium and one of the members was talking about the whole octane vs altitude thing.
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