Maruti Suzuki Fronx Mileage. Maruti Suzuki Fronx claimed mileage starts from 20.01kmpl to 22.89kmpl. The mileage of Fronx 2023 Petrol 2023 is 21.79kmpl to 22.89kmpl and Fronx Turbo Petrol mileage ranges between 20.01kmpl - 21.50kmpl.