First, welcome to the forum! Glad you found us!!
Second, since this is your first post on the forums, you may want to tell us what the original problem was....and why you posted this in the 4X2 forum....
Third, I've been running regular in my FJ for the last 6 months now with NO problems here at sea level. Like I said, describe what's going on. There are a TOM of people here with more knowledge than most dealership service bays.