514 km in 42 liters...it makes around 12.5 kilometers per liter, which is pretty okay for city driving for a 1300 cc car, but since you traveled on GT road, i am assuming it was more or less like city driving... hence this average..
we recently traveled through motorway from Lhr to Isl, speed was 120-140 km, and it did 380 km in 25 liters regular fuel... making it around 15.2 km/l , which is good at 120+ speeds.