Premium fuel is recommended, but not required in the FJ - there\'s actually an official Toyota bulletin on this issue. I\'ve burned a few tankfuls of 87 octane and experience no knocking or drastic decrease in performance. That said, I now only use premium because it actually saves me a bit of money by the tankful - about $1.50 to $2.00. I get about 16 mpg on 87 octane, and 18 mpg on 93 octane.
BTW, http:fjcruiserforums.com is the absolute best online source for all things FJC. There are some quirks and bugs, but they\'re minor in my opinion - windshield is a rock magnet, blind spot, etc., but orders of magnitude hands-down better quality than the junk I\'ve driven in the past.
I love mine and plan to keep it for a very long time. I bought it in November and have already had it offroad and am very pleased with its performance. I have the 6spd manual transmission -full time 4wd (hence lower mpg than the automatic tranny), rear locker, virtual front locker (A-Trac system - installed myself for $60!) and a stock water-fording depth of 27.5\" - three inches more than a Hummer (but who\'s comparing...), and a rubberized interior w/ waterproof seats - you can hose it out.