Possible Over Fueling

[Higgy]

Apologies for repeating details posted elsewhere in a specific 170 thread but I thought this might be more of a generic issue.

I am getting lower than expected MPG (clocked an average 41mpg over a 26 mile trip on mixed A & B roads) so I had a word with my local VW specialist (not a main dealer) and he said it might be over fueling. I am thinking of getting him to run a diagnostic check and then depending on the result go back to the garage I bought it from last week as they said I should get much better economy than my GTI and the weather is now a bit warmer than last week. Does anyone have any thoughts or opinions on over fueling. Also how would I know if the DPF was playing up as I have heard that can cause a drop in MPG - the DPF light is not on and I didn't think to ask when I spoke to the garage earlier.

Thanks

[RisingRoc]

Couple of questions:

1. How vigourous was your driving? I could easily get 41mpg if I get the foot down.
2. How was traffic? Stop/start and statuionary periods do quickly eat away at your average mpg.
3. How old is the car? The engine get better fuel economy as it breaks in.

[Higgy]

It was mixed speeds between 30 - 60 but no real foot down as it was back roads so mostly steady with no real traffic other than getting stuck behind a slow driver doing 40 for half of the journey!

The car is just over 2 years old with 24k on the clock.

On the drive from London to Norwich when we picked it up we averaged 44 and other than a bit of traffic out of London it was a steady motorway run most of the way home with maybe 10 minutes of sitting in traffic. Weather was cold and people have said that can effect it - first diesel car so hadn't realised but it wasnt that cold on the above trip!