Hyundai New i20 (2020-2023) mileage varies, depending on the variant. The petrol-manual variant has a mileage of 20.35 km/l. The petrol-automatic model has a mileage of 20.25 km/l. The diesel-manual variant has a mileage of 25.20 km/l. Note that the mileage figures are as per ARAI.