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The Supreme Court will hear an E20- petition on August 31 that asks for something motorists currently do not consistently get at the fuel pump: a clear statement of exactly how much ethanol is in the petrol being sold.

The petition, filed by Narendra Kumar Goswami, seeks mandatory and uniform ethanol-content labels on every petrol dispensing nozzle. It also wants the ethanol percentage printed clearly on fuel invoices. The matter is listed before Justices M M Sundresh and Prasanna B Varale.

But the plea goes considerably further than pump labels. It asks for a public vehicle-compatibility database, an independent expert assessment of E20’s effect on the existing vehicle fleet, and a transition framework for older vehicles that may not have been designed for higher ethanol blends.

The Supreme Court has not ruled on these demands. August 31 is the scheduled hearing, not an order requiring oil companies to change pumps immediately.

One of the most useful requests in the petition is for an official searchable database. The proposed database would let an owner search by manufacturer, model, engine type and year of manufacture to see which ethanol blends the vehicle is suitable for.

Newer vehicles are increasingly designed and certified around E20, but the road fleet includes petrol vehicles built under different standards over many years. Owners often have to rely on owner’s manuals, manufacturer advisories, dealer responses or general government statements to work out compatibility.

The petition also asks that authorities place before the court the technical studies, compatibility reports, safety standards, consumer advisories and public-consultation records supporting the compulsory E20 rollout.

That demand has become particularly relevant because the public argument around E20 increasingly revolves around competing claims about mileage, material compatibility and long-term durability.

The petitioner has sought an independent expert committee including representatives from the petroleum ministry, road transport ministry and Bureau of Indian Standards, along with independent automobile engineers.

Its proposed scope includes fuel efficiency, engine longevity, maintenance costs, warranty and insurance implications, environmental impact, water consumption linked to ethanol production and concerns around diversion of crops towards fuel.

This is broader than asking whether a modern E20-compatible engine can run normally on the fuel. For an owner of an older car or motorcycle, the practical questions are different: Will fuel economy fall? Are seals, hoses and other fuel-system materials compatible? Does the manufacturer approve E20? What happens to warranty coverage? And is a lower-ethanol alternative available?

The petition asks for a transparent transition framework for legacy and non-compatible vehicles. It specifically seeks consideration of designated lower-ethanol petrol where technically, economically and logistically feasible, backed by expert material and public consultation.

That does not mean the court will order E10 to return nationwide. It is one of the remedies being requested. This is crucial because the government’s 2021 ethanol roadmap itself discussed a protection-grade E10 fuel during the transition to E20. The same roadmap estimated different mileage penalties depending on how a vehicle was designed and calibrated.

E20 is now encountered across much of the retail network, while newer vehicles have progressively been made compatible. The case before the Supreme Court therefore centres less on whether ethanol blending should exist and more on what information and choices motorists should receive during the transition. The simplest demand is also the easiest to understand.

If a pump is dispensing petrol containing 20 percent ethanol, put that information clearly on the nozzle and the bill. If the blend is different, disclose that too.

The more difficult question is what should happen when the vehicle filling up at that nozzle was never designed for the fuel being supplied.