Found this spreadsheet on Reddit that someone (author - Twinbee) has put together regards tyres for Tesla M3: Comparison of Model 3 compatible tires (235/45-18", 235/40-19", 235/35-20") according to ratings from TireRack and TyreReviews (sorted by tire category and rating) Reddit link here: https://www.reddit.com/r/teslamotors/comments/d5q0z9/version_2_comparison_of_best_model_3_compatible/
Just had the rears replaced at 18k miles (they were down to 1.6). Front are still at 4. Probably reflects my driving style... M3 LR. Michelin PS4 XL Acoustics (OEM). I was told that there's a shortage of these tyres in the UK so I ended up with Michelin Primacy 4 on the back (I lease so it's what Arnold Clark would cover).
That list hasn't been updated in awhile. I mention that as the Quatrac 5's are end of life and the Quatrac Pro's are next level goodness.
Tesla's price is only relevant if you're a crazy person who actually lets them sell you tyres! Other tyre vendors are available .
Is the general consensus to swap them out when they get below 3mm? A lot of people seem to wait to reach the west indicators. Would the weight of these cars suggest waiting for wear indicator tread depth would be a big no no?
That's general advice for all vehicles I think, wet performance of tyres drops off significantly when you get below 3mm. Personally I make a judgement call based on the driving I'm planning on doing in the coming months and the likelihood of it being wet or dry, so under 3mm in September with some motorway journeys coming up then I'll change, but local journeys in July/August then I'd probably hang on a bit.