Hello,
I own a 2005 Mk5 GTI DSG, the computer is now telling me 18.9mpg!!! had the car 3 months highest i've seen it is 23mpg,the cars running well,the sevice book is up to date,took it on a 10 mile run driving it like my mom to see how high i could get it 22.5mpg was all i could get,i don't drive it hard (responsible 31 year old!!) used V-max and tesco momentum (99 RON) fuel Had Golf's all my driving life 1.8T,VR6's,but this is really making me wanna swap to diesel sadly beacuse i love everything else about the car!! Hope someone can help me with this problem, cheers.