hi, check tyre pressures,inflate to highest advisable pressure. I have the 03 model 130hp diesel and,I don't like to brag, but I am getting 67mpg, driven sensibly, the tyre pressure affects it very much, as does the speed. it is most efficient at 50mph in fifth gear(it has six). I know this has it has a computer which calculates mpg as you drive.if you throttle it up all the time the fuel consuption dives drastically, down to about 50mpg. as does the tyre pressue if it is reduced to the level of driver only rather than full load pressures. I also had a seat alhambra and with the tyres pumped fully it mad a difference of ten miles to the gallon, which was an amazing thing. don't inflate to a dangerous level, as the higher inflation the less the road grip. so correct tyre pressure and keep off the throttle. as an after thought, if I leave my car ticking over it reduces the mpg by 1, every six minutes, so leaving your petrol mondeo, which is better to drive than my diesel, ticking over in traffic etc probably reduces your consumption by one mpg every few minutes.
all the best, alf.