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Actually, 85 octane fuel in Colorado will behave about the same as 87 octane fuel at near sea level. Read all about it here:

Octane rating - Wikipedia, the free encyclopedia

The rule of thumb is to run your vehicle on the lowest octane fuel that will not cause knocking in the engine. Using higher octane fuel than necessary is just a waste of money.

Octane is not a measure of energy in a gallon of gasoline. In fact, some higher octane fuels may have less energy, because ethanol is often used as a cheap octane booster.

Personally, I would not own a vehicle that requires higher octane fuel. It locks you into paying a premium for fuel for the life of the vehicle. Also, truth is, if I were buying a new vehicle today, I would be buying the absolutely most fuel-efficient vehicle that would meet my needs. The coming $6+ per gallon gas (certainly coming within the lifetime of a new vehicle) will make a gas guzzler a real t**d to own down the road.
I spent my youth and young driving days in Ohio where there is only 87 octane, and when I moved back to Colorado, I was in horror that people were putting 85 in their tanks and there was "no way" I was putting **** water in my tank, but then realized, that like you said, because of the altitude, it behaves like 87 octane at sea level. That being said, I feel Colorado gets kinda ripped off. We pay the same for 85 octane that the rest of the country get 87 for.

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