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One in two owners of petrol vehicles purchased in 2022 or earlier say their vehicle's fuel efficiency has fallen in the last 9 months. 29% of these owners report unusual wear and tear or need for repair in the engine, fuel line, tank or carburettor in the last 9 months. The survey received over 50,000 responses from owners of petrol vehicles across 301 districts of India. Official estimates suggest E20 may reduce mileage by around 1–6%, but many users claim real-world losses are higher, particularly in older vehicles in congested urban driving. Industry estimates indicate that close to 80% of vehicles sold in the last 15 years were designed to run on E5 or E10 fuel blends.
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