I used to run a 1.6 titanium and an S1600 and those figures are probably about the same from what i was achieving. My driving is heavily town influenced (12 miles round trip per day, no motorways and very little above even 40mph).
I eventually worked out that if I filled up when the fuel warning light came on, it should cost me about £45 and i would see somewhere between 280-300 miles range on the trip depending on current driving conditions which was fair for Ford's recommendations.
If you want to work out what your real mpg or cost per mile is then, when you next fill up, top the tank right off. From your fuel receipt, note down the total amount of fuel purchased and the price you paid and make sure you reset the trip.
Next time you fill up, note down the trip mileage, divide this by the total number of liters you put in your car originally and you should come up with a number something like 8 (this is miles/liter). To get mpg, just multiply your answer by 4.55 and you'll get your real mpg!