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If I'm not mistaken, Europe uses a different measurement of octane on its pumps than here in North America. Here, we use the (RON+MON)/2 formula, also known as the "antiknock index". You can read more about octane ratings in Part 3 of the gasoline FAQ for which Lud previously posted a link in this topic.Gas stations in North America typically carry regular gas (87 octane), mid-grade gas (89 octane), and premium gas (93 octane, although California limits this to 91 octane, and one East Coast brand carries 94 octane). High-altitude areas, such as Denver, carry lower octane ratings because that is all that is needed due to the thinner air at those altitudes.
If I'm not mistaken, Europe uses a different measurement of octane on its pumps than here in North America. Here, we use the (RON+MON)/2 formula, also known as the "antiknock index". You can read more about octane ratings in Part 3 of the gasoline FAQ for which Lud previously posted a link in this topic.
Gas stations in North America typically carry regular gas (87 octane), mid-grade gas (89 octane), and premium gas (93 octane, although California limits this to 91 octane, and one East Coast brand carries 94 octane). High-altitude areas, such as Denver, carry lower octane ratings because that is all that is needed due to the thinner air at those altitudes.
