I have the same truck, same set-up. My truck made the same noise when I picked it up from the dealer. I figured they gave me 50$ of reg gas.... yep. Topped up the tank with 93 it got better instantly. Next fill -100%. I don't always get a chance to put 93 but no pinging with 91 Octane. It's a 6.2 lt. giver what she needs. Fyi - you'll likely get better gas mileage. Just FYI - I kicked a 5.0lt 2017 Ford last weekend and I was pulling a heavier boat. He put $60 regular and my 6.2 took $46 same distance.... he didn't talk much about his Ford rest of the weeken!!! I'm Actually impressed with the gas mileage for a 6.2. and It never stressed me out when I bought it.
Who buys / drives a new truck and then comments they can't afford the gas...??? Sorry had to be said.
Sent from my iPhone using Tapatalk