[Mike Tee]

I now have a bit over 2600 km on my B and the cumulative fiel consumption screen (after reset) which was zeroed when I took delivery, shows 7.3 L/100 km (it just went to 7.3 today, so the actual calculated average is probably 7.34).

My actual fuel usage and km driven return a fuel consumption figure of 7.63 L/100 km.

So at least for my car, the fuel consumption screen seems to be about 4% optimistic, which is fine with me, though I prefer being pleasantly surprised at the pump, a little pessimism is OK too. Anyway, plus or minus 0.3 or is close enough.

To get a really accurate read on this, zero the "after reset" screen at a fill, and leave it, checking actual consumption all the time. After 4-5 tanks, you should get a clear picture of how the accuracy is.

My car has been on winter tires for the entire last tank, so 7.7 (the last tank's result) is a pretty good score, considering that. You can see my FE records by clicking on the icon in my signature.

Don't rely on "after start", unless you are burning an entire tank in one day,