You guys are trashing your engines... unless you drive like Grandma.
High compression engines like the 3MZ (10:1 compression ratio) need higher octane for proper performance.
No - it's not a sports car, but it is still a precision engine - which is why they last so long.
Run what you want in your car - hell, put diesel in it if you want - I don't care what you do to your car! I'm going to listen to the manufacturer (not the dealer who wants my service and to buy a new car from them in a couple years).
