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It doesn't make sense to spend more money on higher octame fuel if your engine is not knocking, and definitely not if the manufacturer calls for lower octane.
"Higher octane" does not mean "higher quality", as some people seem to think.
Here in Colorado there is ethanol in all grades of fuel. Don't know for sure, but I'm guessing that they just put more ethanol in the higher octane fuels and charge a lot more for the effort, while they put mostly ethanol in E-85 and charge a lot less for it. Go figure.
If I had engine knock I would buy mostly low octane and mix in a little E-85 to find the right mix and save some money, but at this altitude the burn is slowed naturally by much thinner air, so there isn't much need for higher octane fuels. Sure doesn't stop people from buying it though.
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