even when i was getting 8kmpl,full tank was giving 320-330km in 40litre round about
250 is very less,it becomes an avg of around 6kmpl,is it driven by driver? who floors it alot?
since i noticed myself as well if i push it in 5k rpm's,i notice a quick drop of fuel needle,all cars do the same though
but still there seems to be something wrong with your car,is it maintained properly?