My 184 Quattro s-tronic driven mostly in auto has returned a average of 37.2 mph over 5500 miles from new. Mph is getting better was 36.2 overall. I drive to work on a roads and motorways. Refuel on standard diesel from Tesco.
Clean rusted area and repaint with suitable Hammerite type paint should sort it out, I don't have a torque wrench at the mo to retighten the wheel nuts. Worth asking your dealer if they can treat the area
My wheel hubs have been rusting for months and now also my brake disc backing plates are rusting, spoiling the finish of my car.
Had a A4 loan car the other week and it's disc backing plates looked a lot more substantial and better painted
Got my A3 back yesterday, early yet but all seems well.
fitted me a new mmi mechanism then rigorously tested it.
Service and loan cars at Derby Audi very good even gave me a bottle of champagne for not fixing it the first time.
hope this helps