Starting April 1, 2026, the Indian automobile sector is set to witness two major transitions that will directly impact your wallet and your vehicle’s health. While on one hand, car manufacturers are gearing up for another price hike, on the other, the fuel you pump into your tank is about to change forever. The government’s mandate to switch completely to ‘E20 Fuel’—a blend of 20% ethanol with 80% petrol—comes into effect nationwide this April.

While the primary objective of E20 fuel is to reduce carbon emissions and cut down on oil imports, it brings a significant downside for the average consumer. Technical studies suggest that the lower energy density of ethanol causes a noticeable drop in fuel efficiency. Vehicle owners can expect a 6% to 7% reduction in mileage. This means that even if petrol prices remain unchanged, you will spend more money per kilometer of travel as your car will cover less distance on the same amount of fuel.

The concern is even deeper for owners of older vehicles. Engines manufactured before the E20-compatible era are not designed to handle high ethanol concentrations, which can lead to the corrosion of fuel lines and rubber gaskets over time. Although all new vehicles are being built as ‘E20 Compliant,’ the millions of older cars already on the road face a looming maintenance crisis. With car prices increasing and fuel efficiency decreasing, the new financial year is bringing a dual challenge for the Indian commuter.