I bought a used 2021 Suburban High Country with 70,000 miles in June and it runs fantastic. I have other vehicles that use premium fuel so the price is not a concern. If the engine needs it, it needs it. It moves along pretty good for a 5,300 lb. 4WD drive vehicle. It pulls our travel trailer...
My 2021 Suburban tows fantastic. We pull a Grand Design Imagine MLE 22. It has a slide and weighs around 5200 lbs. unloaded. The Suburban sits a little low in the back but it tows so well, I don't want to adjust it. It will pull at 80 mph, only tried it to see, I usually stay at the truck speed...
I drive with my lights on all the time. There are too many people looking at their cell phones while driving and not seeing my big burgundy Suburban. I have no problem with the auto start on my Suburban. It works quite smoothly.
You might not notice a difference but the computer is probably pulling timing back, especially when the air temps get hot. If you don't run the recommended fuel, drive it like your grandmother. As been said by previous people, you probably won't hear it knocking, unless under a higher load, but...
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