India has officially entered the era of E85 fuel. Recently, the country’s first E85 fuel dispenser was inaugurated in Delhi, with fuel priced at Rs 82.12 per litre. This makes it about Rs 20 cheaper than regular E20 petrol in the national capital. On paper, this looks like a big win for running costs. But there’s another side to the story that buyers need to understand: fuel efficiency.
E85 petrol fuel efficiency explained.
E85 fuel is a blend of 85 percent ethanol and 15 percent gasoline. Ethanol is typically produced from sugarcane, corn and other agricultural feedstocks. However, while E85 fuel is significantly cheaper than gasoline, vehicles running on it typically get lower mileage. The reason lies in the basic energy content of ethanol itself.Petrol has more energy per liter than ethanol. Ethanol burns cleaner and has a higher octane rating, but also has a lower calorific value. Simply put, an engine needs to burn more ethanol-based fuel to produce the same amount of energy that regular gasoline can. This directly affects the kmpl.Globally, flex-fuel vehicles running on E85 typically provide about 20 to 30 percent lower fuel efficiency than pure gasoline, depending on driving conditions, engine tuning, and vehicle type. Real-world losses may vary. Some engines specifically calibrated for ethanol blends can reduce the difference, but the mileage drop is still noticeable.For example, if a petrol motorcycle delivers 50 kmpl on regular fuel, the same bike may see mileage figures fall in the range of 40-42 kmpl when running on E85. But that doesn’t automatically mean running costs go up. Actual savings will depend on final fuel cost, vehicle performance and usage patterns. For long-distance daily commuters, especially two-wheelers, E85 can lower monthly fuel bills if the price differential remains large enough. Currently, however, there is another major limitation: vehicle compatibility.Currently only a handful of vehicles in India can run on E85 fuel. Hero MotoCorp recently launched the Splendor+ Flex Fuel and HF Deluxe Flex Fuel motorcycles, both compatible with ethanol blends up to E85. Suzuki is already selling the Gixxer SF 250 FFV in India, which can also run on higher ethanol blends. Maruti Suzuki Also showcased is the Wagon R Flex Fuel, although pricing and launch timelines are yet to be announced.Infrastructure is another challenge. Currently, the availability of E85 fuel is extremely limited. The government has announced plans to aggressively expand ethanol fuel infrastructure, with around 500 ethanol dispensing stations expected by the end of 2026 and a target of around 5,000 outlets by 2027.
