got no idea of the tank size, all i know is.... back when i first got my car around 3 months ago now, it used to cost me about $35 to fill it if the needle was just nearing the E, i never let it run fully out.... coz honestly who does, and now it costs me about $50, sometimes $60, depending on where i fill up.... generally at a caltex or BP, once again though im speaking from first hand experience, not a math related judgement....