Growing Complaints From Consumers & Mechanics Cloud India's E20 Petrol Rollout - The Ground Reality Explained

Complaints about E20 petrol are no longer confined to the world of social media threads. A fresh nationwide survey and accounts from workshop owners across India point to a widening gap between official assurances and what pre-2023 vehicle owners say they are experiencing on the road.

A survey conducted by LocalCircles in June 2026 found that 66% of owners of pre-2023 petrol vehicles reported a fuel efficiency drop of more than 10%. This was up sharply from 45% in a similar survey the platform ran in May 2026.

The survey received over 44,000 responses from petrol vehicle owners across 305 districts of India. According to LocalCircles, the share of respondents reporting unusual wear and tear or an increased need for repairs also rose, climbing to 55% from 29% over the same one-month period.

The community platform noted that these findings reflect the first-hand, on-road experience of vehicle owners and it has urged policymakers to allow owners of pre-2023 petrol vehicles the option of purchasing lower ethanol blends such as E5 or E10.

Individual complaints have also surfaced online. Chandigarh-based rally driver Rattan Dhillon, (@ShivrattanDhil1 on X), has repeatedly flagged E20-related problems in high-end vehicles.In a recent post, Dhillon shared a video from Dinesh Kirola better known as stockburner on Instagram, who was complaining about how the E20 blend could damage his Mercedes G-Wagon a performance SUV worth over Rs 4 crore.

However, that video and the post on X failed to note that Mercedes-Benz India has said all its BS6-compliant cars sold since 2018 are E20-compatible, having made the shift two years ahead of the industry deadline when it moved to Euro 6 emission norms.

Mercedes-Benz India MD and CEO Santosh Iyer had earlier stated that material compatibility with E20 fuel extends even to cars the company sold before formal certification began, giving the brand's older vehicles a cushion that mass-market models built to older norms do not have.

However, these claims on social media are not just a bit of clout gaining viral videos. Workshop owners across the country have described a similar pattern on the mechanical side.

A car workshop owner in Chinnamanur, Tamil Nadu, said vehicles not specifically designed or certified for E20 fuel have been arriving at his workshop with a range of issues He believes these issues are linked to the higher ethanol blend.

He also stated that E20 petrol also has a shorter storage life compared to conventional petrol, and that fuel left unused in a tank for an extended period may deteriorate. This deterioration in turn can cause fuel system-related issues, in addition to affecting rubber seals, hoses and other components in older vehicles not engineered for E20 compatibility, resulting in premature wear over time.

Another mechanic in Chingavanam, Kottayam, said using E20 fuel definitely affects mileage. He added that he has noticed damage to rubber parts on many older cars brought in for service. He also reported rusting issues, stating that vehicles parked for extended periods while running on E20 petrol can develop rust on other components.

However, not every mechanic reported the same pattern. Workshop operators contacted in Bangalore and other cities across the country said they had not observed similar mechanical issues so far. However, they did say customers had frequently complained about a drop in mileage.

(DriveSpark could not independently verify whether E20 alone caused these issues reported by the mechanics mentioned above, as vehicle age, maintenance history, storage conditions, contaminated fuel, and existing wear may also be contributing factors.)

Auto manufacturers, on the other hand, have pushed back against the narrative of widespread damage. At a recent industry briefing, Maruti Suzuki said its service records covering over 1.5 crore older vehicles had shown no issues linked to E20 fuel.

Hero MotoCorp said older vehicles manufactured prior to April 2023 had been tested extensively for performance and durability with E20, with no major issue observed so far. It acknowledged fuel efficiency could see a marginal impact in some older models.

Honda Cars India has said all its vehicles manufactured in the country since January 1, 2009 are E20 material-compatible, meaning their fuel systems on older cars can handle the ethanol blend without requiring any major work or part replacement.

Toyota Kirloskar Motor recently addressed a viral video involving an Innova Hycross that appeared to malfunction after refuelling with E20 petrol. The company said its technical assessment found the cause was contaminated fuel rather than the ethanol blend itself.

Toyota added that the vehicle's fuel system was found undamaged after inspection, and that the car returned to normal operation once the tank and fuel lines were drained, cleaned and refilled with standard E20 petrol.

DriveSpark Thinks!

The pattern emerging from workshops and survey data suggests the E20 debate cannot be settled by anecdote alone, and it should not need to be. The gap between manufacturer assurances covering vehicles built to spec and the lived experience of owners running decade-old cars on a blend that did not exist when those cars were engineered is not a communication problem.

What stands out is how consistent the complaints are across unrelated garages in Tamil Nadu and Kerala, even as mechanics elsewhere report nothing beyond mileage loss. That inconsistency is itself informative, since it may point toward fuel quality variation and vehicle-specific tolerance rather than a uniform, fuel-wide defect.

It means both blanket dismissals of consumer experience and blanket alarm about engine damage are premature until component-level testing broken down by vehicle age, region and fuel source is made public. Only with this data in hand will the current communication gap about the E20 blended fuel between the government, OEMs and the general public be resolved.