Doubt you'll see any noticeable difference depending on age/mileage.
I know a lot of people with other cars (mainly VAG dervs) who have seen mpg gains by mapping.
Obviously regular servicing and just generally looking after the car I'd hope that you'll keep your mpg as it should be over time.
My mate had a terraclean done on his golf GTTDI and said it made an improvement...
I know a lot of people with other cars (mainly VAG dervs) who have seen mpg gains by mapping.
Obviously regular servicing and just generally looking after the car I'd hope that you'll keep your mpg as it should be over time.
My mate had a terraclean done on his golf GTTDI and said it made an improvement...