E20 petrol under fire! Mileage, engine fears and politics behind India's ethanol debate

While the government describes ethanol blending as a strategic move to strengthen energy security, reduce crude oil imports and support farmers, many motorists continue to question whether the transition has come at the expense of fuel efficiency and consumer choice.

The discussion has intensified in recent months after motorists across the country reported noticeable reductions in mileage, while some owners of older vehicles also expressed concerns over possible long-term mechanical effects.

Political criticism has further escalated following comments made during proceedings in the Supreme Court, where aspects of the rollout were described as being in an experimental phase before the government later issued a clarification.

Although the controversy has generated strong opinions, the central question is not whether ethanol should be used as a transport fuel.

Instead, the debate centres on whether E20 has been introduced too quickly, whether consumers received adequate information, and whether enough evidence exists regarding its long-term impact on older vehicles.

What is E20 petrol?

E20 petrol contains 20 percent ethanol and 80 percent petrol.

Ethanol is primarily produced from sugarcane, molasses and surplus foodgrains such as maize and rice.

India achieved its target of 20 percent ethanol blending ahead of schedule in 2026, making E20 the standard petrol available across most fuel stations.

New survey claims E20 fuel may be increasing repair bills. Representational photo: Pexels/Fahad Puthawala

The government views ethanol blending as an important component of its broader strategy to reduce dependence on imported crude oil, strengthen energy security, lower greenhouse gas emissions and provide an additional market for agricultural produce.

Officials have also indicated that higher ethanol blends could be introduced in the future as India's biofuel programme expands.

Why are motorists complaining about mileage?

The most widespread complaint concerns fuel efficiency.

Unlike petrol, ethanol contains lower energy content per litre. As a result, engines generally consume slightly more fuel to generate the same amount of power.

Many motorists have reported mileage reductions after switching to E20 petrol.

Consumer surveys conducted in recent months indicate that a significant number of owners of older petrol vehicles believe their fuel economy has declined, with some claiming reductions well beyond official estimates.

Automobile manufacturers, however, say some reduction in mileage is expected because of ethanol's lower energy density.

Toyota Kirloskar Motor's Country Head and Executive Vice President for Corporate Affairs and Governance, Vikram Gulati, acknowledged that fuel efficiency may decline modestly.

"It is not so big as it being made out to be," Gulati said in an interview with ANI, estimating the mileage reduction at around 2–4 percent.

Automotive testing agencies have also projected relatively modest losses under controlled conditions, although real-world experiences continue to vary depending on vehicle age, engine condition, driving style and traffic conditions.

Toyota Kirloskar Motor's Country Head and Executive Vice President for Corporate Affairs and Governance, Vikram Gulati. Photo: Toyota India

Does E20 damage vehicle engines?

The second major area of concern involves engine durability, particularly in vehicles manufactured before E20-compatible specifications became standard.

Social media has witnessed widespread claims suggesting that ethanol-blended petrol damages engines, corrodes fuel lines and accelerates wear and tear.

The government and automobile manufacturers reject claims of widespread engine damage.

According to Gulati, all vehicles manufactured after April 1, 2023, are fully compatible with E20 petrol.

"E20 is the standard fuel that will be available and it is compatible with old vehicles and new vehicles," he said.

Referring to a study conducted by the Automotive Research Association of India (ARAI), Gulati said research found that any possible damage to older vehicles was "very insignificant."

Government agencies have repeatedly stated that extensive testing has not found evidence of widespread engine failures caused by E20.

Nevertheless, owners of older vehicles continue to seek more long-term data, arguing that several years of real-world usage will provide a clearer assessment than laboratory testing alone.

How did the 'experiment' controversy begin?

The debate intensified after proceedings before the Supreme Court, during which aspects of the E20 rollout were described as being in a trial or experimental phase.

The remark prompted criticism from opposition parties and motorists, who argued that consumers appeared to be participating in a large-scale experiment without adequate information.

The Centre later clarified its position, saying the observation referred to the logistics of implementation and supply-chain rollout rather than suggesting that E20 itself was an experimental fuel.

Government officials stressed that consumers were not being treated as "guinea pigs" and maintained that ethanol blending had undergone years of scientific evaluation before nationwide implementation.

Why are politicians facing criticism?

Political criticism has focused on both the rollout strategy and its economic implications.

Opposition leaders and several commentators argue that motorists continue paying nearly the same price for E20 despite ethanol having lower energy content than conventional petrol.

They contend that reduced mileage effectively increases the cost of travelling each kilometre.

Another criticism concerns consumer choice.

In many regions, E20 has effectively replaced regular petrol instead of being offered alongside it, leaving owners of older vehicles with limited alternatives.

Critics have also questioned whether sufficient numbers of E20-compatible vehicles were already on Indian roads before the nationwide transition began.

Some political parties further argue that ethanol policy disproportionately benefits sugar mills, ethanol distilleries and associated industries while distributing the costs among millions of vehicle owners.

The government rejects these allegations, saying the programme supports both farmers and the broader national economy.

Why has Nitin Gadkari become the face of the debate?

Union Minister of Road Transport and Highways, Nitin Gadkari, has emerged as the most visible political figure associated with ethanol blending because he has consistently promoted alternative fuels for several years.

Union Minister for Road Transport and Highways, Nitin Gadkari. Photo: Facebook/@nitingadkary

Gadkari has repeatedly argued that ethanol can reduce India's dependence on imported crude oil, lower emissions and improve farmers' incomes.

As E20 became the dominant fuel across the country, many motorists who experienced lower mileage began directing criticism towards him, largely because of his long-standing public advocacy of ethanol.

Some critics have also questioned whether the policy primarily benefits sugar producers and ethanol manufacturers.

However, the ethanol blending programme is not the initiative of a single minister.

It involves multiple ministries, including petroleum, agriculture, food and finance, and was approved by the Union Cabinet as part of India's national biofuel strategy.

How does the government defend the policy?

The Centre maintains that ethanol blending delivers multiple long-term benefits beyond transport.

Officials argue that reducing crude oil imports strengthens India's energy security while insulating the economy from global oil price volatility and geopolitical disruptions.

The government also says ethanol creates an additional income stream for farmers by increasing demand for sugarcane and surplus grains.

Gulati highlighted these wider objectives, saying India's ethanol programme addresses energy security, climate goals and agrarian challenges simultaneously.

"India has always been energy deficient. We import huge amounts of crude," he said, adding that ethanol helps reduce vulnerability to international supply disruptions.

He also noted that the programme has generated substantial financial savings while increasing payments to farmers.

On environmental benefits, Gulati described ethanol as a carbon-neutral fuel because crops absorb carbon dioxide during cultivation before releasing it again when the fuel is burned.

What lies at the heart of the E20 debate?

The discussion surrounding E20 has evolved beyond a technical question of fuel composition.

Supporters argue that ethanol blending strengthens India's energy independence, reduces emissions and provides significant benefits to agriculture.

Critics, meanwhile, continue to seek greater transparency on real-world mileage, long-term compatibility for older vehicles and wider consumer choice at fuel stations.

As India considers higher ethanol blends (E85, E100, etc.) in the coming years, the debate increasingly revolves around balancing national energy objectives with consumer experience, vehicle compatibility and public confidence in the transition.