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Should my Ford Mondeo be returning better fuel economy than just 47mpg?

I purchased a new Ford Mondeo 2.0 Duratorque TDCI (115PS) 6-speed manual in October last year. The car has now done 6,500 miles. The Ford brochure indicates fuel consumption of: Urban 44mpg, Extra Urban 61mpg and combined 53mpg. Although I accept these figures are under ideal test conditions I am very perturbed that I am unable to exceed more than 47mpg. This figure I have calculated during long motorway driving at nearly constant speed of 66mph. I have had the car computer-tested by the garage from where I bought the car, but it has made no difference. I drive very gently with no excessive acceleration. Is the car a rogue car, should it be showing better fuel consumption figures and would I be justified in insisting the Ford garage does something to improve this apparently excessive fuel consumption?

Asked on 3 April 2011 by GB, Amesbury, Wilts

Answered by Honest John
I have actually tested this car over more than 600 miles and averaged 51.5 mpg with three people and their luggage aboard: www.honestjohn.co.uk/road-tests/ford/ford-mondeo-e.../. But we have now set up the Real Life Fuel Economy Register (www.honestjohn.co.uk/realmpg) where owners and drivers can register their own mpg. The system then adds their mpg to a total and divided by the number of contributors to give everyone a better impression of what they are really likely to get.

Real MPG enables you to register the fuel economy you are actually getting against your make and model of car, its engine and type of transmission.

Every time you enter an average consumption figure against your car, the overall average automatically adjusts to reflect it.

Real MPG
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