I cleared all cookies from Chrome, Opera, and FF, and went to http://www.capitalone.com/autoloans/
Chrome and Opera both gave me rates of 3.5%.
Firefox gave me 2.7%.
I proxy my FF sessions through a ssh tunnel to a personal Linux server I have, which is located in Michigan. So to see if that had an effect on it, I cleared cookies again and then disabled the proxy settings. Restarted FF and went to the URL again. This time I got a rate of 2.3%.
I went back to Opera and Chrome, deleted cookies and restarted again. Now Opera was 2.3%, and Chrome was 3.1%. Did it again, and Opera was still at 2.3%, and Chrome had dropped to 2.7%. It's as if this site is just coming up with totally random numbers.