India’s E10 Petrol Plea: Protecting Older Vehicles from E20

A prominent government adviser in India has called for the reintroduction of a lower ethanol blend petrol, specifically E10, to protect millions of older vehicles. This recommendation directly addresses growing concerns regarding India’s E20 ethanol policy, which made the 20% ethanol blend the sole petrol option available since April 1st.

While the government has refuted claims of E20 causing engine damage, Chief Economic Advisor V Anantha Nageswaran and consultant Akash Poojari outlined potential problems. Their opinion piece in the *Indian Express* highlights risks to India’s substantial fleet of older two-wheelers.

Why Older Vehicles Face Challenges

The primary concern centers on approximately 75 to 80 million pre-BS-IV vehicles, which are equipped with carburettors. These older components are not designed to adapt to the increased oxygen content present in E20 fuel.

• Carburettors in these vehicles cause engines to run hotter due to the inability to adjust to E20’s oxygen levels.
• Older rubber seals, which are not rated for ethanol, can degrade upon contact with the fuel, irrespective of engine temperature.

The authors propose that offering a lower-blend fuel like E10 alongside E20 would protect this existing vehicle fleet. This transitional measure would allow the government to continue its ethanol program while a comprehensive retrofit initiative, which could take years to complete, is implemented.

Energy Impact and Broader Concerns

Regarding fuel efficiency, the authors estimate an overall energy penalty of around 6-7% when using E20. They also noted that tests conducted in both the United States and India have found no evidence of increased engine wear in vehicles already compatible with E20.

The opinion piece also raises critical questions about any future increases in ethanol blending beyond the current E20 target. Such moves could intensify competition for agricultural resources and impact water use.

• Increasing blending levels could pit maize, a key ethanol feedstock, against essential oilseed crops for agricultural land.
• Concerns exist regarding the significant use of ‘blue water’ (from rivers, canals, and groundwater) required for ethanol production.
• The climate benefits of blending beyond E20 remain unclear, as studies on grain-based ethanol’s emissions impact vary after factoring in cultivation and processing.

Despite acknowledging the substantial benefits of India’s ethanol program, including clearing sugarcane arrears and supporting rural incomes, the authors urge caution. They argue that policymakers should prioritize easily reversible measures.

Policy Recommendations for Reversibility

The advisers recommend a series of policy adjustments to mitigate risks and ensure sustainability.

• Adjusting procurement prices for ethanol feedstocks.
• Revising water-use rules for ethanol production.
• Ensuring the availability of lower-blend petrol options.
• Restoring an E10 option for consumers.

They emphasize the critical need to fully assess the food-versus-fuel trade-off before making further adjustments to India’s ethanol blend targets, ensuring a balanced approach to energy and agricultural policy.