New Delhi, Oct. 13 -- After the Bharat Stage VI emissions norms were implemented in 2020, petrol's minimum octane rating was upped from an average baseline of 88 RON to 91 RON (Research Octane Number). As of now, regular E20 petrol is claimed to carry a much higher baseline of around 95-98 RON, while premium fuel, such as XP95 or Power95, offers a similar octane rating alongside additives to clean the fuel system. Consumers can also choose high-octane petrol rated for 100 RON with little to no ethanol content. While this seems like the way to go if you want to avoid ethanol content in your fuel, 100-octane petrol costs about Rs.60 per litre more than regular petrol, bringing diminishing returns for cars which do not require it.

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