Lab tests show ethanol blend in E20 petrol as high as 31% in Karnataka

E20 is petrol blended with ethanol at a 20% level. The remaining 80% is petrol. Ethanol is an alcohol-based fuel made from crops and other biological materials. India is promoting blending to support farmers and reduce reliance on petrol, although the article highlights concerns about mileage and vehicle compatibility.

The number describes the blend, not the vehicle’s age or engine size. For example, petrol containing 20 litres of ethanol and 80 litres of petrol in every 100 litres would be E20. Karnataka officials alleged that some tested samples went well beyond this level, reaching 31.2%.

The prescribed 20% level matters because vehicles are certified for particular fuel blends. The article says vehicles sold after April 2023 were certified only up to E20. Petrol above that level could therefore create questions about efficiency, performance, warranties, and consumer protection.

Karnataka officials reported ethanol levels above the prescribed 20% limit in samples collected from several districts. The findings matter because E20 is presented as the government’s blending standard, while vehicles and consumers may not be prepared for substantially higher concentrations.

Indian Oil Corporation Limited, or IOCL, recorded the highest reported level at 31.2%. Hindustan Petroleum Corporation Limited, or HPCL, recorded 30.5%. Bharat Petroleum Corporation Limited, Nayara, and Shell samples showed 26.5%, 26.1%, and 25.5%, respectively. These figures were obtained from samples collected in Bengaluru Urban, Bengaluru Rural, Kolar, Chikkaballapura, Tumakuru, and Dakshina Kannada.

Every reported result exceeded 20%. The highest result was 11.2 percentage points above the prescribed level. Karnataka said the samples were later tested at NABL- and ISO-recognised laboratories. The State government said it would place the findings before the Union Government and demanded an investigation.

The transparency concern arose because ethanol content was one of the prescribed testing parameters, according to Karnataka’s Food, Civil Supplies and Consumer Affairs Minister Rizwan Arshad. Yet the initial reports from company laboratories allegedly did not disclose that measurement. Consumers therefore could not see whether the fuel matched the prescribed E20 level.

The department first submitted samples to the in-house laboratories of IOCL and BPCL. Arshad said those reports omitted ethanol content. The same samples were then tested at laboratories recognised by the National Accreditation Board for Testing and Calibration Laboratories and the International Organisation for Standardisation. Those later reports showed higher ethanol blends.

The difference between the reports prompted allegations that oil companies were not providing full information. Karnataka described this as a serious transparency issue and sought accountability. The State said it would present its findings to the Union Government, while also demanding disclosure of ethanol content at every petrol pump.

When petrol contains more ethanol than a vehicle is designed to use, fuel economy can fall because ethanol contains less energy per litre than petrol. Drivers may need to buy more fuel to travel the same distance. The article also raises concerns about vehicle performance and compatibility, particularly because many vehicles were not built for blends above E20.

The article says 99% of India’s more than 35 crore vehicles are not built for ethanol blends above 20%. It also says vehicles sold after April 2023 were certified only up to E20. In that situation, a blend above 20% could create uncertainty around engine operation, fuel-system components, emissions systems, and manufacturer support. The exact effect would depend on the vehicle.

Possible consequences include lower mileage, harder starting, reduced performance, or additional maintenance. The article does not provide repair-cost estimates. It does, however, describe a broader consumer risk because lower-ethanol petrol has reportedly been withdrawn from nearly one lakh fuel stations.

The article links lower fuel efficiency to a large potential cost for motorists. It assumes a 10% mileage loss and petrol priced at ₹100 per litre. On that basis, Rizwan Arshad said the hidden loss to consumers could reach around ₹62,000 crore. This is presented as an estimate, not a confirmed nationwide bill.

The basic mechanism is straightforward. If a vehicle travels fewer kilometres on each litre, the driver must purchase more litres for the same journey. At ₹100 per litre, every additional litre directly increases travel costs. A 10% efficiency loss would therefore raise fuel use significantly across India’s vehicle fleet.

The supplied article cuts off after saying the estimate was based on India’s annual petrol consumption. It does not include that consumption figure, so the calculation cannot be independently checked from the provided text. The estimate also does not separate vehicle types, driving patterns, or actual mileage losses.

Ethanol-blended petrol involves several organisations rather than one single body. The Union Government sets national blending policy and the prescribed E20 level. Oil marketing companies, including IOCL, HPCL, and BPCL, supply petrol through their networks. Private suppliers named in the article include Nayara and Shell.

Testing can occur in company laboratories or in independent laboratories accredited through NABL processes. The article says Karnataka’s department used laboratories recognised by NABL and ISO after reviewing company reports. Karnataka’s Department of Food, Civil Supplies and Consumer Affairs collected samples and pursued testing, giving it a direct consumer-protection role in this case.

The article does not identify every organisation responsible for technical standards, certification, or final enforcement. It says the Union Government prescribed the 20% standard and that Karnataka would place its findings before that government. It also calls for investigation, strict action, and ethanol-content disclosure at fuel stations.

The article gives two main reasons for ethanol blending: it says blending helps farmers and supports the wider fuel strategy. It also reports that ethanol production capacity has surpassed blending requirements, prompting calls to find additional uses. These points show why the government and industry continue to promote ethanol in petrol.

Ethanol differs from petrol in its chemical source and energy content. Petrol is a fossil fuel refined from crude oil. Ethanol is an alcohol fuel commonly produced from biological feedstocks such as sugarcane or grains. Ethanol contains less energy per litre than petrol, so a higher blend can reduce mileage in some vehicles. The article specifically cites concerns about fuel efficiency.

The policy challenge is balancing these benefits with compatibility and transparency. The article says lower-ethanol petrol has been withdrawn from nearly one lakh fuel stations, leaving consumers with few alternatives. It also reports alleged blends above E20, increasing demands for testing, disclosure, and safeguards.