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It's more:
Tyre 1 🔴
Tyre 2 🔴
Tyre 3 🟠(red soon, maybe another ~1K miles)
Tyre 4 🟠(just gone amber, maybe another ~3k miles)I'll replace all 4, and will weigh up either keeping the Volvo specific ones, or Michelin Pilot Sport 4 S.
The reviews basically say that they're neck and neck on everything, with Pirelli barely beating the Michelin in the wet and being fractionally quieter, and the Michelin having a better subjective feel and comfort to drive but being fractionally louder. All reviews acknowledge that as they're both the very best in their class there is virtually no difference between them and it's just personal taste.
The Pirelli are £235 per tyre = £940
The Michelin are £290 per tyre = £1,160 but with a 10% discount on Black Circles comes down to £1,044
Velocio-
Definitely change all 4. I changed from P Zeros to PS4S on my previous car and I was far happier with the PS4S. Didn't seem to be much in it on hot, dry days but whenever there was any kind of moisture the Michelin's were far superior and I experienced far less wheel slip. This was on a FWD car with 300bhp so it really didn't take much for the car to break traction, just trying to pull away from a roundabout was sketchy with the Pirellis!
Go for the Michelins.
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If you can be bothered to drive out to Stevenage, I can get you 4 Pilot Sport 4S for £835 fitted at Costco.
ElGonzo
Soul
^^ My reading is:
Tyre 1 🔴
Tyre 2 🔴
Tyre 3 ðŸŸ
Tyre 4 🟢
Given that searching, price benchmarking, ordering and carving out time to have tyres fitted is non-trivial, I don't see the extra few mm of wear from tyre 3 as enough of a benefit to counter the hassle of doing this all again in the near future.
But if you don't do many miles and that's >6 months of wear left in tyre 3, then I guess it's worth leaving it.
Also as big tyres are expensive there is a cash flow benefit.