I remember getting almost 800km out of a full tank in the 102 a couple of years ago, but that was almost entirely on open road/highways and before I got my exhaust and intake on... And the fuel light is a useless indicator, mine will come on and go off when there's more than 15L left in the tank because I'm going up hill, or around a roundabout too fast, or even over bumps. Both ways that I go out of my street in the morning lead to very steep down-hill bits before turning onto the main road, so I'm often sitting there for up to 5 minutes waiting for a break in traffic. During that time, my fuel gauge can go up by almost a quarter because of the slope, and the opposite if I'm stuck at the top of Beaumont St waiting to turn onto Glebe Rd. Filling the tank all the way to the top, then driving for a long distance and refilling it to the top and measuring the ks travelled is the only reliable way of getting fuel consumption figures. Also, saying how many ks you get out of a tank is useless unless you state how big the fuel tank actually is. My parents regularly get more than 700km per tank in their Camry, but that's a 70L tank, whereas the Corolla is only 50L. Plus, you never put a full tank of fuel in, and never the same amount each time either, thus a L/100km or km/L figure is the only real way to compare.