I got my 06 car serviced 2 weeks ago - full service and 3 new tyres.
Since then I have seen my fuel consumption significantly increase - where I would normally get 600km easily on a full tank, now I'm getting about 400-450km for similar journeys
Should I wait for a few more weeks to see if it improves or contact the garage - whats the most likely explanation?
New tyres are not the same, but are brand new dunlops compared to the pretty bald ones that were on it before (cant remember the make) - I was expecting better performance rather than significantly poorer based on the fact they were new ones.
I believe it may be a dodgey oxygen or air-flow sensor. It is not an unusual problem on 05/06 Ford 1.4 petrol engines. Go back to where you had it serviced and complain. It should have been checked.
Yup, possibly a faulty AFM which is making the car run rich. Take to a garage and get them to plug the car in and check the lambda/integrated lambda readings.