Ford fiesta fuel consumption problem?

Ford fiesta fuel consumption problem?

Added (1). i know this is a how longs a piece of string question but i've recently brought a 2003 fiesta zetec 1.4 and i just feel its using to much petrol. There does not seem to be any problems though. Its starts and seems to run fine… Maybe a little slow acceleration

1 - it is 12 years old and was designed to last 10 years
2 - its a 2002 model year version made when cars are nowhere nearly as good on fuel economy as current ones are
3 - it was rated at 43 mpg by laboratory style tests used for comparison only - in reality when new and in perfect condition it probably managed around 37 to 38 mpg. After many miles, years and unknown servicing it will not do that now