Car tyres and fuel efficiency

Scary how energy saving tyres (early ones at least) had poor grip, and how narrow tyres are on some cars (e.g. BMW i3).

Modern tyres are so much better; Continental Eco Contact 6 can be labelled A for fuel effiency and A for wet grip (EU A-G ratings) with a 71dB noise level (185/65-R15-088H). This is dependent on size, speed and weight ratings, a smaller 155/75-R13-075T tyre is C and B respectively at 70dB https://www.continental-tyres.co.uk/b2c/car/tyres/ecocontact-6.html

It’s detailed a bit here: https://www.tyrereviews.com/Article/EU-Tire-Label-Current-status-and-challenges.htm

I don’t know whether the test detail has changed, but in 2021 the EU went to A-G ratings. That article deals with the older A-E ratings