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Roof racks, roof bars, top boxes and heavy loads make a big difference to fuel consumption. In vehicles with onboard computers it is easy to see the lower mpg - up to 25% less in many cases. So, only use such 'drag' items when necessary.
Regular servicing to keep your car in tip-top condition is essential to the longer life of engine components and to ensure lower fuel and oil consumption. 'Honest John' regularly mentions in the Daily Telegraph Motoring section the economy of having the oil changed much earlier than recommended by many motor manufacturers, particularly for new cars. Have you considered early oil and filter changes to possibly extend the life of your car?