How accurate is your dis

[simonwjones]

My previous A6, 1.9tdi 130 had no dis and I always worked on a figure of £10 of fuel would do me about 75-80 miles.

I now have a 2.5 tdi 180Q sport and am getting 100 miles to the same £10 of fuel.

Strange as I expected the consumption to go down. Based on this I have calcuted that my average consumption is 42 based on 93p per litre.

My DIS shows an average consumption of 31mpg.

Now I wasnt expecting it to be accurate but this is miles out.

How does you DIS compare to you manual calculations?

Cheers

Simon

 

[Quattravant]

My previous car (2.5tdi sport avant multitronic) registered about 33-35 mpg average on the DIS (too many stop/start/short journeys), which when I calculated it back from fuel receipts/mileage records, was pretty accurate. I could achieve 40-42 on a long run but I would have to be driving very carefully.

My new 3.0tdi is not as good (but improving as it loosens up) but the DIS is still fairly accurate (30-33 mpg).

I'm assuming you are comparing like-with-like, as diesel costs have varied by as much as 10% over the last 18 months or so.

 

[alanadams]

My 2.5TDI consistently shows 1.5mpg worse than the real figure. The real figure varies between 28mpg and 37 (the latter on cruise control on motorway).

 

[marsmail]

I have 3.0Tdi with 18000 miles. The DIS was regularly 6% or thereabouts optomistic. Since the service about 1 month ago, it seems to be about right, although I have only made one long journey (200+ miles each way) and got about 40 mpg. Normal use gives about 32-33mpg

 

[fjtwelve]

My figures are almost identical to Mr Adams above, over the last 56000 miles.