Change Oil yourself, Use oil grade 5w30 or 10w30. Total 5W30 is recommended. Mileage is affected by Air Pressure also, which people normally doesn't count. Keep air pressure in front TYres 32 psi, Rear 30 PSI. U will get better mileage inshAllah. Check air with digital Machine. Not AAM TYRE WALA manual guage. tc