Started my 06 3.2 Quattro up today and the fuel gauge was on empty and it said 0 miles to empty. Filled 'er up and it still said empty. Is this a common problem? It was in the teens today don't know if that contributed. I took it through the car wash to get all the snow and ice off it and shortly after that it started working correctly again.

 

Buy yourself a VAG COM www.ross-tech.com and pull the fault codes from the instrument cluster (module 17)
It could be a gauge problem, or one of the fuel senders are malfunctioning.

 

There is a TSB on the problem. The software needs to be updated. Audi does the update for free. I had it done on my 05 4.2. Just make an appointment with your dealer.