Hi I own a golf mk 6 1.6 tdi bluemotion DSG 7 speed for nearly 3 years now is been the perfect car till last year August when I had it serviced , since then the fuel consumption started to grow as it was doing 50+ mpg and now is doing 35mpg average . Can anybody please advise me what can I do to return it to 50+ mpg ? It has full vw service history and 84k miles on the clock . Driving nice and slow no hills or bad traffic doing about 24 miles a day to work and back .
Thank you