The list of potential failures above are unlikely to occur within a 3-year warranty anyway. I bought my TA Lounge new in March 2011 and so far it has done just over 20,000 miles with no failures at all. Incidentally, I endorse most of the above regarding economy -the 1.2 is a cheaper proposition overall.
I suppose in Fiat's defence, I don't think their adverts ever over promoted the economy of the TA, just the emissions. I know that one is directly related to the other, but at least the official emissions figures mean free road tax and (for now) congestion charge.
I also suspect that all of these new-generation small petrol turbos will fall far short of the official mpg figures. Diesels seem more capable of getting close, in my experience.