Prayagraj innovator builds six-stroke engine with 176 KMPL mileage, runs on multiple fuels

In a country like India, where mileage often decides the fate of a vehicle, fuel efficiency is more than just a selling point, it’s a necessity for millions of daily commuters. Rising petrol and diesel costs have always pushed buyers to look for vehicles that 'give more average'. But what if one engine not only delivered record-breaking mileage but could also run on multiple fuels, petrol, diesel, CNG, even ethanol?

That is exactly what Shailendra Gaur from Prayagraj has achieved after 18 years of relentless research. His groundbreaking six-stroke engine promises to transform the way India, and potentially the world, thinks about mobility.

A Dream Forged Through Sacrifice

An Allahabad University alumnus, Gaur once had an opportunity with Tata Motors but chose innovation over a corporate job. In 2007, he converted his rented house into a workshop, selling his farmland, home, and shop to fund his experiments. With occasional inputs from experts at MNNIT and IIT-BHU, he tirelessly pursued his vision of building a more efficient engine.

How the Six-stroke Engine Works

Unlike the conventional four-stroke design, Gaur’s engine adds two extra strokes for additional expansion and exhaust, capturing far more of the fuel’s energy. The result, nearly 70% energy utilization, compared to just 30% in standard engines. More importantly, its fuel-flexibility allows it to run on petrol, diesel, CNG, and ethanol, making it versatile and future-ready.

Record-breaking Trials

In one test, a 100 cc TVS bike fitted with Gaur’s engine ran 35 minutes on just 50 ml of petrol, translating to an extraordinary 176 km per litre.

तस्वीर में दिख रहे यह महान शख्स इनका नाम शैलेंद्र गौर है इन्होंने 6- स्ट्रोक इंजन का आविष्कार किया है जिससे 1L पेट्रोल, डीज़ल में 176 Km तक का एवरेज बाइक देने की क्षमता रखती है इन्होंने अपनी जिंदगी के अमूल 18 वर्ष एवं संपूर्ण संपत्ति इस अविष्कार में लगा दी।#shailendragaur pic.twitter.com/2mA3ctvRHy

— Harshit Yadav (@Harshittt_yadav) August 27, 2025

In another demonstration, it achieved 120 km per litre, far surpassing current mileage benchmarks. Reports also confirm near-zero emissions, aligning with Bharat Stage-VI norms.

The Road Ahead

With two patents secured and more pending, Gaur’s innovation has drawn national and international attention. What it needs now is the right backing from government and industry to bring this eco-friendly, multi-fuel engine from workshop prototype to the mass market.