the barrel price is low, perhaps chevron spread their mapping of low octane (because of elevation) areas out to a more broad spectrum, I would rather a gas company drop the octane a titch in a high elevation area and keep an excellent additive package rather than skimp on the package to keep octane high. as has been stated octane doesn't = quality. But I have used 85 octane in my cars for 23 years of driving, well except when required for more like my outback H6 requires. but even then the numbers come under there recommendation you just take it with a grain of salt understanding what has been stated already higher elevation demands less octane to run detonation free, you only want to run enough octane that the car can run detonation free without any timing retarding from the knock sensors any more is just money burning
just my .02
just my .02
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