I have just over 4000 miles on my N (non PP ) i have had on problems running 87 here in Alabama when i go on a trip i use mid or premium depending on how far i intend to go . the dealership told me I could run regular 87 with no problem . depending on price i probably run mid most of the time soooooo.....
Agreed! I see it happen in our dealerships more often than you would think. If the service writer notates you using any other fuel than recommended, your power train warranty gets voided. I've seen it happen at my Hyundai, Mazda and Subaru stores.If you put anything other than 91 you're asking for trouble. The manual states 91 + octane.
Using 89 or 87 octane will cause detonation at higher rpm and boost. Plus don't tell your service manager you've been utilizing 89 or 87 octane. They will note it and then when you have problems, cite it as part of the possible cause to the problem.
Don't do it!!