Posted on 6/9/2015
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