Maruti Suzuki Esteem comes with a petrol engine and the best way to increase its mileage is by driving not too aggressively. Changing gears at proper intervals by not revving the car to a higher rpm can help in maintaining a proper mileage. The car should be driven in bigger gears and it will return a good mileage while on highways. The engine oil of the car should be changed at given intervals, making it sludge free for lifetime. Keeping the required air pressure in all the tyres also reduces friction and makes it to a healthy mileage.