The government's nationwide rollout of E20 petrol has come under increased scrutiny following a wave of consumer complaints, criticism from opposition leaders and widespread discussion on social media. In response, senior representatives from the government and the automotive industry have reiterated their support for the ethanol blending programme, maintaining that current evidence does not point to widespread vehicle-related issues.
The debate intensified after reports suggested that Attorney General for India R Venkataramani had described the country's ethanol blending programme as an "experiment" during a court hearing, stating that its results would become clear only next year. The government later clarified that the remarks referred to ethanol supply volumes rather than the E20 fuel policy itself, while Venkataramani also stated that his comments had been taken out of context. However, the episode added momentum to an already growing public debate over E20.
Industry Reiterates Support for E20
At a government briefing held on July 4, several automakers defended the ethanol blending programme and addressed concerns regarding the use of E20 fuel in older vehicles designed for E10 petrol.
Maruti Suzuki senior executive officer for corporate affairs, Rahul Bharti, said that E20 compatibility became mandatory with the introduction of Bharat Stage 6 Phase 2 regulations in April 2023, replacing the earlier E10 standard.
"As a manufacturer, we have tested E10 cars, which were prevalent before 2023, on E20 fuel for all parameters, and we have not found anything of concern," Bharti said, adding that the company had not observed significant issues related to corrosion, wear or component durability during its internal evaluations.
Hero MotoCorp chief business officer Ashutosh Varma echoed that position, stating that analysis of crores of service records had not revealed any higher incidence of damage in vehicles operating on E20 compared with previous fuel blends.
Toyota Kirloskar Motor country head and executive vice-president Vikram Gulati also defended the programme, saying vehicles and fuels undergo extensive testing, certification and homologation before reaching customers. Referring to a widely circulated social media video of an Innova Hycross reportedly breaking down after refuelling, Gulati said the incident was linked to contaminated fuel rather than E20 itself.
The government has also continued to emphasise the broader objectives of the ethanol blending programme, including reducing crude oil imports, lowering emissions and supporting domestic agriculture.
Mileage Concerns Remain a Key Issue
Speaking at a separate briefing on July 2, petroleum minister Hardeep Singh Puri acknowledged that vehicles running on ethanol-blended fuel could experience a slight reduction in fuel efficiency, while noting that ethanol is also used in motorsport applications because of its performance characteristics.
However, concerns around reduced mileage continue to be among the primary issues raised by motorists, alongside questions over the long-term impact of ethanol on older vehicles and overall ownership costs.
SIAM Had Earlier Favoured Continued Availability of E10
The current industry position differs from recommendations made several years ago. In a 2021 report prepared for NITI Aayog, the Society of Indian Automobile Manufacturers (SIAM) had recommended that E10 remain available nationwide as a "protection-grade fuel" for the country's existing vehicle fleet.
The report noted that retaining E10 would eliminate the need to upgrade fuel system components across a large number of older vehicle models and reduce the burden on consumers. Those recommendations were not adopted, and the government subsequently advanced the nationwide rollout of E20 ahead of its original 2030 target.
Upgrade Kits Not Being Offered
While some manufacturers had previously indicated that retrofit solutions were under development, no E20 conversion kits are currently being offered commercially.
Bharti said Maruti Suzuki has evaluated multiple technical solutions but does not currently see a requirement to introduce upgrade kits into the market, adding that the company's existing work remains limited to research and development.
Political Criticism Continues
Despite industry assurances, opposition leaders have continued to question the implementation of the policy. Congress leader Priyank Kharge argued that the rollout proceeded without sufficient consultation and said consumer concerns should not be dismissed while further assessments remain underway.
Political analyst Tehseen Poonawalla also organised a protest against the mandatory E20 rollout at Jantar Mantar in New Delhi on July 5, drawing hundreds of participants.
Higher Ethanol Blends Under Consideration
The government has also indicated that it intends to increase ethanol blending levels beyond E20. Standards have already been notified for E22, E25, E27 and E30 fuel blends, while the Automotive Research Association of India (ARAI) has been tasked with studying the impact of E25 on both E20- and E10-compatible vehicles.
Manufacturers have broadly indicated that existing E20-compliant vehicles should be capable of handling moderately higher ethanol blends from a material compatibility perspective, although they have not commented extensively on the implications for performance, emissions or fuel economy.
Bharti said Maruti Suzuki's E20-compatible vehicles incorporate additional engineering margins that would allow for some increase in ethanol content, although he did not specify the upper limit.
Isobutanol Blending for Diesel also Under Consideration
Alongside higher petrol blends, the government is also evaluating the introduction of isobutanol blending in diesel later this year. Isobutanol, an ethanol-derived alcohol, offers higher energy density, lower corrosiveness and reduced water absorption compared with conventional ethanol.
However, diesel passenger vehicles currently on sale in India have not been certified for operation on isobutanol-blended fuel.
What it Means for Vehicle Owners
While manufacturers maintain that E20 does not present immediate compatibility concerns, questions remain over the long-term effects of ethanol exposure, particularly for older vehicles. Ethanol's corrosive properties could affect components within the fuel system over extended periods, with the extent of wear depending on factors such as climate, usage patterns and maintenance practices.
Owners may therefore need to place greater emphasis on preventive maintenance, including periodic injector cleaning and more frequent inspection of fuel hoses and related components. If retrofit solutions eventually become available, they may also offer an additional means of addressing compatibility concerns.
For now, however, motorists continue to weigh the benefits of reduced emissions and lower crude oil imports against concerns over fuel efficiency and potential long-term maintenance costs.
With inputs from Sergius Barretto