For anyone who is still concerned about paying towards the DVLA's "Christmas night out" - have a look your car's data sticker, in the "Audi Service Schedule" front cover and in the spare wheel well - on the bottom line there are figures for official fuel consumption, in the case of my car they are 14.0 7.6 10.0 234 the last one "234" is the one that sets the tax band - in my case L.
If you are paying £475 and the emissions figure for your car on that bit of paper is 225, then get your tax thing sorted as that figure is the figure that the supplying Audi garage should have used when filling in the original reg' forms that ends up with the car getting its first tax disc, and that is what decides what you pay per year - it is not up to DVLA to change things further down the line wrt bands unless any changes are retrospective and so far they have not been.
Alternatively, if that car is second hand and its tax had been returned or had run out, when your supplying garage or you, re-taxed it, DVLA should have picked up the original details, though maybe if, like a lot of S4/RS4 etc it had been previously fitted with private plates, there may have been a mistake made when normal plates were given to it! (just a thought)
