السلام علیکم
Commenting here in 2021 lol, I recently purchased a Toyota Corolla Altis 1.6 SR Cruistronic. It has done around 150k kms and recently I took it to Toyota and got a thorough tuning. However, I did not change the spark plugs nor the fuel filter.
My issue is that my car is giving poor fuel economy, 7.8 km/l by manual calculations but the car computer shows me an average of 9.3 km/l.
Can someone help me out with why there is so much discrepancy between the two?