Blog: Graeme RobertsAbout those US octane ratings...

Graeme Roberts | 14 April 2014

Interesting comment about my earlier blog on US octane ratings from our Brazilian correspondent Fernando Calmon.

"Let me observe that petrol octane rating in the US differs from UK, Europe and elsewhere. They use the so-called anti-knock index (AKI), which is the arithmetic mean of RON (Research Octane Number) and MON (Motor Octane Number), hence the lower figures you correctly mentioned in your article. Actually their 87 AKI is your [Europe's] 91-octane RON, 89 AKI corresponds to 95 RON and 93 AKI, to 98 RON. As a matter of fact Brazil follows the US on this, for we used to export petrol to them some decades ago due to our first ethanol programme.

"By the way, we have a petrol brand here, Podium by BR, that is 102 RON, believed to be the highest octane petrol in the world due to the 75% petrol-25% ethanol blend obligatory by law to any kind of petrol around here."

"Since 1 January the Brazilian petrol sulphur content is 50 parts per million (S50). However, due to the 75-25% petrol-ethanol blend, the actual sulphur content is 37.5 ppm (S37.5), since ethanol is sulphur-free."

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