I have a 2005 Zafira 1.9CDTI 6-speed automatic. I live in London and most of my miles are done in town driving (London). According to the Computer and my measurements the car is returning 28MPG. The book say it should be 47.
Can anyone advise what the problem may be. Its got 17k miles, and has had its first service, which was basically an oil change according to the vauxhall dealer.