Fuel mileage mostly depends on how you drive. I get anywhere between 6-15km/L (E20 fuel) in a Colt Ralliart engine swapped Lancer (4G15 Mivec Turbo with standalone ECU). I also get anywhere between 4.5-12km/L in my Lantis Type R (built engine with Cams, pistons, ITB, standalone ECU, etc)
Other...