Le Monde has good video on the problem with ever bigger cars in Europe
TLDR: EU rules base allowed emissions on mass, so manufacturer increase mass to be allowed more emissions. le Monde initially blames forced addition of catalytic converter and ABS brakes that add uch weight but then go on to the other reasons.
français 9.40 https://youtu.be/5wdWcQPEGTY
(you can get Mr Google to turn on subtitles and then get him to translate to English if nevessary). @notjustbikes