u/AlternativeKnown7654

Hello guys. My Corolla GLI was giving a poor fuel economy of around 8 to 8.7 km/l. After tuning the car the average improved to 11 to 12 km/l but after a month it returned to normal. I'm not sure why as my car is in excellent condition, has only 45,000 km on the odometer, and the engine is also in good shape.