switch gasoline grade

I wonder if it is ok switching gasoline grade from 93 to 89 ?
will it hurt anything.
Toyota recommends 93 octane on my 2004 4runner, but, I switched back to 89 since price is well too high.
Please give me your opinions about if it is good onthe switch.
thanks

Your vehicle runs fine on regular gasoline. You should see if changing from 93 to 89 makes your gas mileage decrease. If not, I would use 89. If you notice a decrease in gas mileage with 89, stay with the 93.