Hi Catrin,
The other aspect you want to consider besides the wear rate of the tread is their traction. From my limited understanding, better the traction, shorter the life of the tire or less traction for longer wear. I've never heard of 90K tires. Something new.
Example of the traction or wear is a yokohama tires I have on my prius. It's around 50K miles. Traction is okay. I also had a high performance tire on my exotic car. Tires on it lasted 15k miles if you drove really gently. But the traction was more than enough to give your neck a great work out on sharp corners. Traction in the rain was still better than the average tire.
So instead of just looking at the milage rating, you may want to look at how they perform on rain/snow on the road. Other things to consider is its effect on gas consumption. My OEM Prius tires got better milage than the current yokohama tires.
Sorry to muddy it up.
As for the extended warranties, I almost always forgo the extended as they are usually not that good of a deal.



Reply With Quote