well, the OEM wheel size is so weird (for North America) that when I went with snow tires I had them mounted on 18-inch alloy wheels (and the TPMS). Not cheap. But now I have way more tire options.

I have liked the Michelin MXV4 tires on my Audi and they were OEM on my Camry hybrid so I wonder how they would do on the Highlander.

Sorry this isn't the hard-data info you might seek.

The OEM wheel size on the 2008 HyHi is more common in Japan. I wonder if any Japanese-market tire evaluations would help you. Alas, I am completely illiterate when it comes to Japanese these days...