E85 rules in 2026: India to test E100-ready cars nationwide

The next step after the E20 rollout

India is preparing to move beyond E20 petrol, with the government likely to notify a regulatory framework for testing higher ethanol blends such as E85 and E100. Sources told Business Today that the notification is expected within a week. The goal, according to the report, is to enable industry-wide testing before any decision on large-scale deployment. This would mark the next phase of India’s ethanol roadmap after the nationwide rollout of E20.

The shift matters because higher ethanol blends are not a simple extension of E20. They require different vehicle engineering, new fuel retail practices, and clearer compliance standards. The proposed framework aims to generate testing data on performance, emissions, and durability, which can then feed into future policy decisions.

What the upcoming notification is expected to do

The expected notification is focused on formalising a standardised testing regime for higher ethanol fuels. As outlined by sources, it will set protocols covering vehicle performance, emissions, and durability for blends in the E85 to E100 range. The intent is to allow controlled, large-scale trials by automakers and other stakeholders.

Critically, the testing-first approach signals that the government is not yet committing to immediate mass adoption. Instead, it is creating a compliance and technical standards backbone that does not exist today for E85 and E100. India’s current policy framework extends to E20 but does not cover the higher blends, which is why new regulations are required.

Consultations with automakers and oil companies

The government has already held discussions with automakers to assess readiness and define testing requirements for E85 to E100 blends, the report said. These consultations are focused on engine compatibility with higher ethanol content, the impact on fuel efficiency and emissions, and infrastructure and supply considerations. Separately, TOI reported that the petroleum and natural gas ministry has held two rounds of meetings with vehicle manufacturers on flex-fuel vehicles.

Industry feedback has flagged consumer-facing concerns that become sharper at high ethanol concentrations. One key issue is lower mileage because ethanol has lower energy density than petrol. As per TOI, the industry sought clarity on fuel station rollout, compensation for mileage loss estimated around 27 to 30 percent, and incentives for buyers given flex-fuel vehicles are expected to be more expensive.

Why E85 is being treated differently from E20

Multiple reports indicate E85 is expected to debut as a separate fuel grade rather than replacing existing petrol blends. This distinction is central to avoiding misfuelling and managing the transition for India’s large installed base of petrol vehicles. Several accounts also note that using E85 in non-compatible vehicles can lead to mechanical issues, including corrosion and engine damage.

The shift from E10 to E20 involved adaptation and phased vehicle compatibility. But the jump from E20 to E85 is described as a structural change, with E85 compatibility requiring flex-fuel designs from the outset. This creates a practical barrier for converting existing E20 vehicles, which is described as neither simple nor cost-effective in the provided text.

Vehicle compatibility and consumer risk

A core concern in the public debate is the fate of existing vehicles engineered for E10 or E20. The text highlights risks from running high ethanol blends in regular petrol engines, including corrosion of fuel system components, degradation of seals and hoses, erratic combustion, and long-term engine damage. Because of these risks, the reports argue for clear labelling and consumer awareness to prevent wrong-fuel incidents.

The emphasis on testing protocols for durability and emissions also reflects how compatibility needs verification under Indian operating conditions. Stakeholders are effectively asking for evidence, not assumptions, before fuel grades move from pilots to wider availability.

Infrastructure requirements at fuel stations

Beyond vehicles, E85 distribution requires separate storage and dispensing systems. The provided text notes that fuel stations would need separate tanks and dispensing systems for E85, along with clear labelling. This adds operational complexity for oil marketing companies already managing the nationwide E20 transition.

Because E85 is expected to be a separate grade, the retail network would need to handle multiple petrol variants in parallel. That makes rollout sequencing and geography important, even at the pilot stage, to avoid supply disruptions or consumer confusion.

Policy background: E20 milestones and earlier testing work

India has achieved its target of 20 percent ethanol blending and mandated a nationwide rollout of E20 from April 1, 2026. The broader ecosystem has also seen earlier steps: India mandated E20 fuel compatibility for all new petrol-powered vehicles starting in 2023, as cited in the text.

The article set also references technical evaluation work for E20. In 2021, the Automotive Research Association of India (ARAI) conducted pan-industry testing to assess the impact of E20 on legacy vehicles, with results indicating E20 would not affect vehicles themselves. The same commentary notes that moving beyond E20 requires extensive technical evaluation, reinforcing why the government is moving through a testing framework for higher blends.

Prior regulatory attempts: what lapsed and what may change

TOI reported that the road transport ministry notified “applicability of test requirements” for vehicles that can run on E5 to E85 in December 2022. Later, a draft notification to replace the condition of E85 with “E85 or more” was issued on June 27, 2025. However, the final notification was not issued within the stipulated six months, and the process lapsed.

The renewed push now appears to be returning to a similar objective: creating test requirements that support flex-fuel vehicles capable of operating on very high ethanol blends, including near-E100 use cases.

Key facts at a glance

Market impact: who is affected and how

For automakers, the immediate impact is compliance and product planning. A formal testing regime creates clearer targets for prototypes and eventual homologation of flex-fuel vehicles. But it also raises questions around pricing, consumer messaging, and rollout timing, especially if E85 is offered alongside E20 for a long period.

For oil marketing companies, the biggest practical implication is infrastructure. Separate storage, dispensing, and labelling for a new fuel grade requires capital spending and operational changes. For ethanol producers and the broader biofuel supply chain, the framework signals policy intent to explore higher blends, but the text makes clear that large-scale adoption depends on test outcomes and readiness of vehicles and fuel supply chains.

Why the testing-first approach matters

The reports present a common theme: ambition needs to be aligned with readiness. The government’s proposed framework is designed to gather data under controlled trials, rather than forcing a rapid shift that could disrupt existing vehicles. It also gives regulators a path to set technical standards and compliance mechanisms before broad availability.

At the same time, the discussion around mileage loss and consumer concerns suggests that policy design may need to address operating costs and communication. If E85 expands, maintaining lower blends like E20 for the legacy fleet and ensuring clear labelling become essential operational safeguards.

Conclusion

India’s move to notify testing rules for E85 and E100 within a week, as reported by Business Today, sets up a structured pathway to evaluate high ethanol blends beyond E20. The consultations with automakers and earlier regulatory attempts show the groundwork is already in motion, but key constraints remain around vehicle compatibility and fuel retail infrastructure. The next concrete step, based on the reports, is the issuance of testing norms and stakeholder feedback that can shape pilot deployments before any decision on wider rollout.