Tata Harrier (2020-2023) mileage varies, depending on the variant. The diesel-manual variant of Tata Harrier (2020-2023) has a mileage of 16.35 km/l. The diesel-automatic variant of Tata Harrier (2020-2023) has a mileage of 16.35km/l. Note that the mileage figures are as per ARAI.