mazdamazda, I'm not very active on the GrupoRav4 forum, but there is a member who I think works for bridgestone main ofc, but he can also get you other brands. His handle is Mr.Ty. I've gone from 16" to 17" to 18", there was about a month where I had the 16's before switching to the 18's, and there is a noticeable change in speedo readings. Full consumption, I can't really say because my rav is a low mileage ride, 25,000km in 2 years. Btw, I got my 18" tires (GIIIs) from Tyrone, aka Mr. Ty.