A car that is maintained should never achieve fuel economy so poor.
Drive it lightly for a complete tank and you should see at LEAST 400km's to a tank of juice ~50litres.
A few places to start looking regarding fuel economy.
O2 sensor, airflow meter, injectors.
When my fuel economy went to sh*t and started getting 350km's to a tank I replaced the o2 sensor with no affect, I then replaced injectors and it was all fine and dandy again.
and for the cold start hessitation.. The only way I fixed mine was with a PFC.