I wonder if these code readers off Ebay are any good? I know that the ones for the VW's are good and cost around £20.

The car runs fine, starts first time everytime and pulls very well, just cant understand 19MPG when she is being driven with such care. All 6 plugs have been changed, new air filter, oil filter, new oil, new fuel filter, throttle body cleaned, ICV cleaned and only run on 98Ron fuel.