Fuel consumption has a huge number of variables that can affect the outcome, and particularly with an older car, even if it is kept in immaculate condition the years of service can take their toll on how a vehicle performs.

Looking at the official fuel consumption figures for your car, the urban figure is 22.4mpg - which is exactly what you appear to be getting - while the combined figure is 31.0mpg, which incorporates some higher speed driving. We suggest you reset the trip meter and take the car on a steady 30 minute drive on a dual carriageway or motorway. If it returns a figure of over 30mpg for this journey it would suggest there is no problem.

It's worth remembering that the Mondeo is quite a large car, a 20-year-old design and has a naturally-aspirated engine with a torque converter gearbox, so even if it were brand new it would still be a relatively thirsty machine.