Tax exemption under threat?

[willswitchengage]

2 hours ago, EightMegs said:

CO/km should be negligible if you have a working catalytic converter, and CO2 per kilometre doesn't have anything to do with the ULEZ, Euro 4 is about particulates, unburnt hydrocarbons, and nitrogen oxides coming out of the exhaust. Compare the MOT exhaust gas analysis from a 25 year old Civic with a modern one and I think you'd be surprised at what's coming out.

Typo! I meant gCO2/km