Interesting. I've always used just regular 87 octane unleaded.
I played around with 91 octane, but noticed no difference whatsoever. (Possibly an increase of 1-2 mpg, but that within the placebo effect.)
Currently, 91 is running about 50-60 cents/gallon more than regular, so why spend...
I have a bone stock 2020 with about 85k miles.
I've too have had these issue for some time, but it's so intermittent it makes it difficult to take it to the shop (I have the extended warranty).
I first tried the oil change. That didn't work at all. I also reset the transmission with the...
It was a tune designed for me to optimize MPG balanced with an increase in HP while using regular unleaded pump gas. Both were supposed to be only moderate to conservative gains, but should have been noticeable. My truck is bone stock.