Even after engine turn up the toyota car IST 2004 model does a low performance of 7.5km per liter.

Even Gear box oil has been changed. What else should be done to obtain better performance.

This vehicle was purchased by in this October. Rgs

. Check for codes.

. Use full synthetic engine oil and transmission fluid. Together, they should increase gas mileage 8 to 10%.

. Clean MAF Sensor with MAF Sensor Cleaner.

. Replace Oxygen Sensor, air filter, and Engine Coolant Temperature (ECT) Sensor, if you suspect they are part of the problem.