My Q2 is the 1st Edition, 2.0 tdi Quattro 190bhp version. Recently I was struggling to get over 40mpg no matter what kind of trip I did in her, even long motorway trips. So, I got Carista set up and saw some fault codes, I cleared them and now I am getting around 55mpg when on a long trip. Same roads, same fuel! Unfortunately, I didn't make a note of the fault codes but I would love to hear of anyone who has done this or for anyone who might know a reason why this would happen.