With mixed hwy and city driving I have burned just 1/4 of a tank after driving 400 km. This will be my best mixed tank ever.
I have just started lately to fill my car up to the middle of the fill hose, After learning of the air bleed off technique by pressing the switch in the fill hose where the gas cap normally would hit the pressure release switch.
Doing it this way allows me to fill 1-2 gallons more in the tank and gives me precise fill ups.