According to Official Guinness Records,
The lowest fuel consumption driving across India on a motorcycle is 1.68 litres per 100 km, achieved by Pavitra Patro and Vishnu Mehta (both India) from Arunachal Pradesh to Gujarat, India, from 12-22 June 2018.This is the first successful attempt at setting this record.
For a complete list of 2018 records, please visit 2018 Guinness Records in India.