It doesn't matter
99% of the time. My car requires premium, but every so often I put in 87. This typically results in slightly less MPG (~20 vs. ~21 for a mixed tank). There's no noticeable difference in power, no pinging, etc. I'm cheap, so it's tempting to put in 87 all of the time, but I fill up every 3-4 weeks... so it's not like there's a lot of money to be saved, and paying more for gas that I probably need to makes me feel special.
Some guy with a similar car did a many-tanks-long experiment comparing 87 to 93, and found no significant difference except that using 87 cost less. He had an excel spreadsheet and everything, so it had to be true.
They told the EPA it required 91 as well.
Just check your gas flap next time you fuel up.
Toyota actually recommends premium for the Land Cruiser which I find funny. No ill effects or performance issues during my 5+ years of pouring 87 octane in the tank. Previous cars that I felt were more fragile always got premium if the manufacturer recommended/required it.
And the 2004 says 91.. whats your point?
There is one sticker for US cars, no change for regions.
Bottom line narrow band (as in no WOT fueling feedback) turbo charged that runs stoic for as long as possible for emissions reasons is not recommended to run on 87.
Do I need to tell you you're wrong again?
I also find this especially hilarious since you're the one that said you use 87 and I said I use 93.
The higher compression engines, specifically S2000 (11:1) , 944S (10.5:1), and E90 M3 (12:1) always get 91, and frankly the M3 does better with 93 and higher, though that's not readily available here. The exception is the Mazda 3 with the Skyactv-G 2.0, which has a compression ratio of 13:1, but it recommends 87, and that's what we use. It runs perfectly fine and get 40 mpg when driven frugally, but nets 30 mpg even when driven hard and driven at 80 mph average.
The 4Runner (10:1) gets 87, which what's recommend for it and it runs just fine.
I've tuned/tested the 87 which works fine due to the safer fuel strategy used on my car compared to stock, once I get deeper into tuning it despite the better fueling I will not continue to use 87 (maybe I'll make an 87 tune because why not). How the car fuels stock would frighten all but a handful of people on this forum.