I have the same car as you, do 1000-1500 a week on average so been through a few sets over recent years: the best tyres for the rear are Sumitomo HTR - so fricken good that I was obsessed with them at first, on country road trips I remember lying awake in motels wondering where's the catch...
To me they even smell right... I have no idea what makes some new Asian Tyres I've tried stink up the garage like recycled vulcanized crap, but it is enough to freak out my cat and it ain't there with a quality compound like the HTR.
Price is similar to cheap stinky stamped-out Taiwanese / Vietnamese rings made from waste byproduct but what astounds is the Japanese quality and attention to detail here - ticks all the boxes technically, looks great and most importantly grip and wear characteristics are ideal for the rear on our v8 wagon at 45psi.
Typical Japanese quality control - air freighted next day to my local tyre shop and a leap above most Kuhmos (I love kuhmo for value so put up with the roar previously).
These High Tech Radials are simply outstanding tyres for the money.
I suggest Sumitomo HTR 255/40-19 on the rear and Kuhmo KU19 245/40-19 for the front (no, this model doesn't roar and is the pick of big hire car companies). If you need to rotate then get all sumitomo HTR, pay the extra to gas up with Nitrogen.
Sumitomo also have a 60,000k service guarantee just not on these particular low profile top speed rated HTRs but driven mercilessly will still see you in the Bridgestone ballpark without undue noise and really good grip.
