Fair enough, but.... I never would have thought of it, but look at page 159 of the owner's manual:

"If you need snow tires, the recommended size for the front and rear is the same size as the original equipment front tires. This size tire on the rear allows the use of tire chains on the rear wheels. Selection of this size tire also requires the purchase of two additional wheels with the same size specification as the original equipment from wheels."

Sure, they go on to warn that snow tires (which my car will NEVER see) are not to be driven at speeds over 75 mph... but I see no other warnings against same-size tires.

Now, maybe the warning is IMPLIED and they assume you will go back to performance tires and different sizes when spring comes.... and that you will never go fast with the same-size tires all around because they are snow tires.

But it doesn't SAY that.

Just a thought I have been mulling over ... I'm still willing to listen. '

So keep talking!