87 or 91 octane gas

[Miami-Dade]

If you are at 191k miles using 87 octane without any issues or knocking, then I'd say keep on using it.

@Nagloc68 I agree with this.

 

[Capybarbro]

If you want actual data on the topic AAA did a study on this a few years back using a '16 Escalade. The only car that experienced knock was the Audi A3.

Engineering Explained does a good breakdown and is worth 13 minutes of your time in my opinion.