Interesting thing I've just noticed...
Manual GTI-P.... 155g/km.... I wondered if adding bigger wheels and a sunroof would change the CO2 figure... upwards..
It does change it...
Well, the wheels do... add 19's and it drops to 153g/km... I wonder if that's a glitch or actually the real VED figure?
My understanding under WLTP is that vehicles with options fitted that materiallly affect the weight of the vehicle such as larger wheels and sunroof had to be tested separately. I assumed this meant the tests would have to be run for cars specifically fitted with these options, and separate MPG / emissions figures produced. So lots of additional testing in addition to a standard, vanilla spec car for each engine/trim level, which would also help explain why it’s taken so long for WLTP testing to be completed.
Perhaps some of the Golf’s 19” wheel options with tyres fitted weigh less than a car with the standard wheels + tyres? (I believe 19” Pretoria alloys weigh less than the standard 18” Cadiz alloys on the R). If so, that could explain the lower CO2 figure with 19” wheels.