Originally Posted by Jimsan
My door says 89 octane minimum for my 2014. So if I go to a higher octane will I notice a markedly higher performance? How do I notice it?
you will not notice anything other than placebo effect.
You may notice some extra performance going from 89 to 93. You should get better gas mileage too.
2014 528ix M Sport. Space Gray/Mocha Brown Nappa Leather, Anthracite Wood Trim, Continental RFT's. Packages: ACC Stop & Go + Active Driving Assistant, Driver Assistance, Driver Assistance +, Lighting, Lux & Prem. Options: Paddle Shifters, H-K. S S System, Heated FS's & Power Rear Shade with Man SS's.
2013 X3 28i M Sport. Deep Sea Blue/Sand Beige Nevada Leather, FS Wood Trim, BMW Apps, HG Rails and GY LS All Seasons. Packages: Cold, Conv, DHP, Perform, Prem, Prem Sound and Tech.