Well... I tried two different driving style with my last two fill up. About 80% highway 20% city driving.
Same daily commute. 56km each way.
First with my lead foot. I managed 450km on 40litres. Then i figured Id try sticking to the speed limits for once and go easy on the throttle when accelerating. I made it 750km on 41litres.
Its not what you drive, its how you drive it.