i usually get around 6L/100km, think it cost around $50 to fill up after driving 550km. i drive a 2009 lancer. it is ridiculous with the price of petrol these days, even if you have an economical car. we also have a v6 commodore on gas, which does around 12-14L/100km on that. thank goodness otherwise it costs $70-90 to fill with petrol, which is always unsettling lol.