No cheat software on those engines....apparently
Who knows what the true C02 figures will be in the end though.
My 63 plate manual 184 with 18" wheels from the factory still shows on my log book with C02 of 109 with tax at £20.
I own my car and paid in full on day one and I intend to carry on enjoying the car for a long time and not worry about a few numbers unless my tax goes up to £300 or something