This isn't really specific to Golfs but I note there are several threads that mention it. I'm confused.
I though WLTP was the name of a test. Is this true?
But is there also new legislation that includes, amongst other things, requiring a particulate filter in a petrol car?
If the above is true, where is the balanced thinking that offsets the unavoidably worse efficiency caused by putting a resistance in the exhaust with the vanishingly small amount of particulate emissions produced by a modern petrol engine?