I just got a 2008 mustang convertible V6 I'm using now 87 octane, I was wondering if I should be upgrading to 91 octane? And what's the deferent?
Lol this jokes cracks me up all the time +1You will be faster if you run a higher octane... Because your wallet will be lighter (had to crack that joke), thats about it unless you are tuned for a higher octane. The newer Mustangs computers are able to adjust to the different octanes and make more power on their own, i don't know if your model has it though. I would just run 87 unless you get a tune for higher.