What car do you have? MY07 STI
What engine is it? EJ257
What mods that may affect fuel? Exhaust, Intake, Injectors, Fuel Pump, VERSO
Whats the transmission, Auto/Manual? 6 MT
How many k's do you get to a full tank? 450km - 550km
What fuel do you use? Ultimate 98

Best I have ever done was 552km and managed to fill up 54L