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Ethanol has a research octane number of about 108.5, compared to petrol’s 84.4. What effective octane rating does 20% ethanol blending (E20) give Indian petrol?

1. Ethanol has a research octane number of about 108.5, compared to petrol’s 84.4. What effective octane rating does 20% ethanol blending (E20) give Indian petrol?

 

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