None buick question

I have a 2004 1.8 Zetec Ford Mondeo petrol, its gone really thirsty. Ive done 96 miles on half a tank (£25 quid of petrol). I normally get nearly 200 miles, she was service back in August...any ideas guys? The only thing i can think of is the cold start is stuck on with all this freezing weather we have been having.o No:


I MEANT NON.... NOT NONE

 

Have you checked it for codes?

 

Unfortunately we dont have any Ford diag equipment in work only Peugeot,Kia, Renault, Skoda and Fiat