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Tag Archives: fuel-octane

What do you know about Fuel Octane and does it matter anyway?

What do you know about Fuel Octane and does it matter anyway?

Audi R8 V10 2016 by Mundo Velocidad, used under CC BY-SA 2.0 If you ask the average consumer what they know about octane their response would be something like higher octane is more money and not necessary; part truth and part myth. Let’s explore fuel octane and the variations. In California there are three levels of fuel octane most frequently available; 87, 89, 91. The octane rating scale began in 1926 when a guy named Graham Edgar experimented by adding two different components; heptane and isooctane to gasoline and discovered engine knocking stopped when more isooctane was added. So he created the rating scale which goes from zero (100% heptane) to 100 (100% isooctane). Therefore fuel with a rating of 91 has more isooctane then either 87 or 89. All car manufacturers issue a minimum octane rating for their car ... read more


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