I just got my car back from the dealer earlier today. They were fixing a small paint chip. Nothing mechanical. Just a little while ago I was going somewhere and got on it and it felt like it was knocking at wot. I turned my rpd to the ignition screen and tried another 2nd gear and 3rd gear run and im seeing 4 deg on knock at wot. Is this normal? I cant remember having any knock before. The motor was fully warmed up and the intake temp was reading 90 deg (normal for S Fla). I dont remember what the mileage was when i turned it in. Im getting the feeling that they might have "driven it more than needed" and then refilled it to the previous fuel level with regular(87), (I use 93)

Im gonna run through the rest of this gas and then refill it to see if it helps, then disconnect the battery if it doesnt