Recently my sister bought an a1 1.6 tdi and went to buy some tax when she found out that the info that Audi sold her are wrong. Audi state that the A1 1.6 TDI produces 99g/km co2 and it's a tax band A which is congestion zone free, Infact it's a tax band B and it produces 105g/km co2 which isn't congestion free. London transport have said this and Audi have admitted to her that they made the mistake.. The question is what should we ask from them? I proposed she gets a new car fully loaded with DRL, cruise, parking sensors, sat nav, the lot.. They said they will give her a full refund but that's not what she wants, otherwise she wouldn't of bought the car! What would you ask, and has this happened to you?