I didn't realize that I went 90mph with Sienna when I went to pick up the avalon. I thought the bigger tires of BFG KO2 helped.I can't imagine a Sienna going 137 mph!!! Maybe on the salt flats on a calm day with a full roll cage. After about 90, it starts to get a little uncomfortable and the handling becomes touchy, but that may just be due to the terrible condition of our road up here.