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I put over 100K miles on a car with a custom dyno tune for 93 octane and only ever put 91 in it. As noted earlier, because of the altitude and the lower pressures that can be achieved even with turbos, you don't need the octane rating up here. The gas companies know that, and that's why the don't supply 93 up here very often. Once you drive back down towards sea level you will start to see 93 again, and once you do, just fill up with 93 while you are down there.
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