Is this a new change? AS we all know 87 Is regular?
The octane requirements as posted here is regular. Is this a recent change?

 

In 2012 they changed it to regular, I am guessing it was back ported to earlier years. Its same engine

 

It never changed, but it is confusing non-the-less. Europe has theirs, US has ours. etc.... I haven't looked in a while, but it seems they specify 91 min but in another type of rating. Due to that, I ran 93 all these years before selling my ES, but after studying it closer, now running 87 in the RX. 87 seems just fine, no knocking.