India’s push toward greener mobility is accelerating, with the government advancing plans to increase ethanol content in petrol beyond the current E20 standard. The Bureau of Indian Standards (BIS) has already laid out parameters for blends such as E22, E25, E27, and even E30, setting the regulatory groundwork for the next phase in India’s bio-fuel journey.
The E20 Experience and What’s Next
Since the rollout of E20 petrol, extensive testing by the Automotive Research Association of India (ARAI), Indian Oil Corporation, and SIAM has shown no catastrophic engine failures or abnormal wear on most legacy vehicles. Everyday drivability remains safe, according to the Ministry of Petroleum and Natural Gas. However, motorists have felt the difference: fuel efficiency has dropped by anywhere from 3% to 12%, with older, pre-BS6 vehicles suffering the most. The physical impact of higher ethanol blends is mainly limited to the degradation of standard rubber parts and gaskets, which can be swapped out for ethanol-resistant materials during routine servicing.
Now, the government is considering a proposal to raise the baseline blend to E21 and E22, with E25 firmly on the horizon. Industry insiders warn that moving to E25 could speed up material degradation in older engines and, for cars calibrated for E20, disrupt air-fuel ratios—leading to even more noticeable performance dips.
Global Context and India’s Flex-Fuel Future
India’s approach mirrors trends in the United States, where E10 and E15 are standard, and higher E85 blends are reserved for certified flex-fuel vehicles. The government in India is clear: motorists with standard cars won’t be forced to use high-ethanol E85 or E100 blends, which will be sold separately for flex-fuel vehicles only.
Japanese manufacturers like Suzuki and Honda already offer flex-fuel motorcycles in India, though demand remains tepid without widespread access to E85 and E100 fuels. Meanwhile, the Ministry of Road Transport and Highways has brought E100 (pure ethanol) under its testing and certification umbrella, clearing the way for pure ethanol-powered vehicles. Maruti Suzuki is reportedly gearing up to launch an E100 flex-fuel vehicle, upgrading its earlier E85 prototype to handle ethanol’s higher moisture absorption and corrosive properties.
As India readies itself for E25 and beyond, motorists with older cars should keep an eye on efficiency and maintenance. The shift to higher ethanol blends is coming fast, and the country’s regulatory machinery is working overtime to ensure a smooth—and greener—transition.
