Where you buy fuel at the rate of 3sen/Liter? i want to go to that station. You never mention what petrol are you using. RON 97 or RON 95? (BTW, VQ is better use 97, else you risk heating up your engine and may blow it)
For fuel calculation, don't use KM/RM, use KM/Liter.
I can clock 420 - 450KM per full tank, (about 58 - 60L) for 80% city driving using RON 97. 95% - 100% highway, about 650km - 700km per full tank.
If you are using mainly city driving, then your fc is normal.