I have a Corsa automatic 1.5L Petrol car, made around 2017. I got this car second-hand in 2022 when it was driven for around 41000 Kilometers.
I drove 10K in first year (mostly highways) and it used to take 5.1 to .5.4 L / 100KM. or 30L for 550 KM.
Then i took my car to change the oil to KwiqFit and since that day that number started going up gradually. And it now does 33L for 450KM. I waited for months to verify and it did not change in summer or winter in past 8-9 months. So i took car to official service center and asked them check for low milage, but they also said no issues in car but oil needs to be changed as oil level was low. Strange to have this situation, as oil was changed barely 5 months back. And even after this, milage still not same as it used to be.
I drive in eco mode, mostly in citi sometime on highways with max speed 110KMH. I have the tyres inflated to the recommended pressure.
Any pointers would be helpful to increase the milage?