Another interesting experience in Denver. In Baltimore and the surrounding areas, the gas stations carry three grades of Gasoline. There is 87 Octane (Regular), 89 Octane (Plus), and 93 Octane (Premium).
In Denver there are also three grades. There is 85 Octane, 87 Octane, and 91 Octane. These three are given the same grades respectively.
Apparently in higher altitudes, engines can run on lower octane gasoline without knocking.
I used the 85 Octane, since it was a rental car and it worked fine.
The prices are similar to Baltimore even though the octane rating is lower. Not sure why. The 85 Octane in Denver was around the same price as the 87 Octane in Baltimore. Maybe there are more taxes.
Also interesting, when I was in Florida a few years ago, there were five grades available. If I remember correctly, there was 86, 87, 89, 91, and 93.
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