The Mangalore Refinery and Petrochemicals Limited (MRPL), a mini-Ratna CPSE PSU refinery based in coastal Karnataka and a subsidiary of ONGC, has become the single largest PSU-refinery (single location) in the country for the year 2022-23, a release from the company said here Wednesday. MRPL achieved this feat by processing 17.14 million metric tonnes of crude oil during the past financial year.