Originally Posted by
F6Dave
No problem. I usually post from memory and that's not always a reliable source!
But something definitely changed on my 2016. It runs fine on 87 octane fuel. But in very hot weather I had to use premium fuel in my 2013. I remember accelerating hard from a stop one extremely hot day. The engine started pinging noticeably. But in a moment it stopped, then started again. It continued that cycle a few more times. I assume the engine's computer detected the knock an made incremental adjustments to the ignition advance. From that day forward I always used premium except on chilly winter days.