Given
57%
while driving a
SEAT Leon FR 2.0 TFSI
(225/45 R17 W) on
a combination of roads
for 6,000
spirited miles
These are the stock tyre on a SEAT Leon FR TFSI and to be honest, I never really expect that much from stock tyres since they're generally decided upon by what corporate deal the manufacturers can strike rather than whether it's a good tyre or not.
In the case of the Rossos, this is also true. They're not an awful tyre by any means, in the dry they're fairly reasonable but wet grip isn't very good (takes an age to get heat into them) and for the price, there are much, much better tyres out there.
If you really must have a set then they'll be fine, but honestly, you'll be far better of with a set of Eagle F1s, Conti Sport Contact 3s or Bridgestone RE050As... alternatively, get a set of Kumho KU31s which will walk all over the Pirellis and pretty much match the others but for a 2/3rds the price!