Porsche Turbos wearing tires quick definitely has nothing to do with speed rating. Absolutely nothing.
.
Ok, what DOES it have to do with wearing quick. And don't say because they are driven more aggressively.
It
has to do with driving more aggressively and more power (to weight ratio). Next factor
is, the type of tire you'll find on these cars or even available in the corresponding sizes (e.g.
Michelin PSS, PS4S, Pirelli P Zero, Goodyear Eage F1 Asymmetric 3/5/6 etc.) do focus on grip,
not on wear.
These tires don't necessarily wear
that quick. My Mini Cooper is sitting on PSS and they wear
quite well as this car is low on power and torque. My Porsche is sitting on PS4 (no PSS available
in 16") and they'll get old before they wear down because this car isn't driven much. My GTI's
PSS however wore down much more quickly by comparision. I don't care though. All tires are
'Y' rated btw., except my winter tires are 'W' and they roughly last twice as long as my summers.
However that's certainly not because of W vs Y. It's because CrossClimate+ wear better than PSS
and I use to drive more conservatively during winter.
.