After one year and 32K on my FJ I decided to go with regular instead of premium gas. I figured that the engine would not like it right away but to my surprise I have seen no difference in performance even while hauling a 16ft. trailer with a yard and a half dirt on it. Until I see diminishing returns on performance or MPG I plan on sticking with the cheap stuff. BTW, I am on my 4th tank of the crappy stuff.