Indian Oil Corporation (IOC) has begun producing specialised 'reference' petrol and diesel in India for the first time. These fuels, which have higher specifications, are used for calibrating and testing automobiles by manufacturers and testing agencies. Previously, India relied on imports for these fuels, but now IOC has developed indigenous products to replace them, ensuring a reliable supply at a lower cost. The fuel, which has higher specifications than regular or premium petrol and diesel, will be unveiled at an upcoming event featuring Oil Minister Hardeep Singh Puri.