FIAT's data on the mpg and CO2 figures of the TA isn't wrong. The procedure how these figures have to be determined is/was wrong, but that is legislation. Unfortunately you prefer bashing FIAT above blaming lousy politicians.
This isn't an uncommon occurrence.
I've lost track of the all the news regarding companies "dodging" tax, when all they are doing is what's totally legal and legit, it's just the legislation is wrong but everyone jumps up and down and the media make us believe it's the fault of these companies involved. They do what they are allowed to do.
Manufacturers will design, make and supply products under whatever legislation is current, they get the rule book and follow it (mostly), they don't write it.
As far as the manufacturers are all concerned, they didn't vote these legislators in, we did, they were as much stuck with it as we are, the proof of this is in the disclaimers they all put in their brochures against these test figures.
If there's anyone really to blame, it's these legislators we voted in (in essence, us), as it is these not the manufacturers that didn't give a f*ck about consumers, it wasn't a manufacturers devised test that may have mislead some of us either.
To add insult to the injury and to further prove these legislators don't give a toss for the consumer, the consumers will now have to pay for the legislators mistakes.
Manufacturers will pass their costs on to us and the legislators will spend more of our taxes devising and implementing more tests.
To debate how mislead some consumers were or how much each vehicle failed to meet the results misses the point completely, they all achieved what they did in the tests (most we believe did it fairly) and all the choices were tested under the same conditions, no manufacturer was offering anything tested differently.
If were were lied to, does it really matter by how much?
The only choice we have is who is making these useless rules and is wasting our money.