10-13 km/l within city, depends upon the city and time you driving. You will get 9-10 in Rush hour. Same goes with gli.
14-17 km/l on highways.
Gli gives 14 on motorway because rpm hits 4 at 120, while grande will give you 15-16 at 140 on motorway.
There are several other factors.
Tyre pressure should be optimum and wind should be stable and oil thickness. If the wind is coming from the front, No matter what you will do, your car will give you no more than 12km/l. If the wind is coming from back side than you're blessed and car will go to 18km/l.
Do not go above 10w-30 oil for zr-fe series engine, you will burn excessive petrol.
That's the last recommended grade for this engine.
Although, you should buy a car with good fuel consumption, but it all depends upon driving habits as well.
Whenever you're driving, try to keep the speed stable according to conditions.
Getting 13km/l with ac in lahore from gli, and 17km/l on gt road. 14km/l on motorway.
hopefully, I will get a better fuel consumption from my oncoming Altis 1.8 cruisetronic
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abcd bta di mein nay