I know this has been touched on but I would like a little more input... So what is the best for the little Skyactive 2.0 87 or 89??? I have read that you run 87 all the way and any more is a waste...I also read that it depends on the brand you fill up with. Big stations Shell Exxon WaWa ect you are good with 87 while if you get fuel at a mom and pop or a smaller station you should run 89. Is there any truth to that ?? In addition is there any difference in MPG based on 87 vs 89? on 89 I am avg around 30 at about 60/40 city Hwy driving this tank...