"Moving beyond E20 to E85/E100 flex fuel vehicles is as much a regulatory challenge as a technological one." Discuss with reference to India's energy security goals.

India reached E20 in Ethanol Supply Year 2025-26 [2]. In October 2026, MoRTH amended the Central Motor Vehicles Rules, 1989 so that E100, alongside E85, is expressly covered in emission certification [1]. Flex fuel vehicles (FFVs) can now be certified. Whether they reach the road depends as much on rules, prices and coordination as on engine design.

Energy security stakes

• Since ESY 2014-15, ethanol blending has saved ₹1.97+ lakh crore in foreign exchange and replaced about 316 lakh MT of crude [2].
• Domestic ethanol does not move with Brent prices or shipping disruptions. Higher blends widen this buffer [2].

Technological challenges

• Hardware: FFVs need fuel-system materials suited to the approved blends and adaptive engine controls for a single tank. An E20-compatible vehicle is not automatically E85-ready [1].
• Efficiency: ethanol has a higher octane rating (RON ~108.5 vs 84.4 for petrol). However, mileage falls by 3–5% even at E20, and the loss grows at higher blends [2].
• Emissions: the benefits depend on feedstock and production process [1].

Regulatory challenges

• Certification: the CMVR change is delegated legislation. It is voluntary and non-retrospective, and fuel use must stay within the range the manufacturer has certified [1].
• Fragmented mandates: MoPNG handles fuel supply, MoRTH handles vehicle certification and BIS sets fuel quality [1][2].
• Dispensing: India has over one lakh retail outlets. Stocking extra base fuels at each one raises costs and makes quality control harder [2].
• Pricing: at about USD 70 per barrel of crude, ethanol is not cheaper than petrol. It becomes cheaper only at around USD 120–130 per barrel [2]. Without tax or price support, consumers have little reason to switch.
• Trust and feedstock: public debate over E20 mileage led MoPNG to issue a clarification on 23 June 2026 [2]. Allowing grain as feedstock since 2018 has raised food vs fuel concerns [2].

Moving to E85/E100 therefore needs both engineering and governance to advance together. Brazil mandates E27, and over 80% of its new cars are FFVs [2]. Its example suggests India needs inter-ministerial coordination, BIS-backed fuel standards, tax parity for FFVs and diversified non-food feedstocks. With these in place, farmers can become Urjadaatas (energy providers) [2], and high-ethanol mobility can support energy security in line with SDG 7.