Here’s a video to show my Octane Booster follow up. Hope you enjoy it. 17,596 miles running on this with no issues.
For a non-AMG S550, I can take an AMG with no problems. (running at about 115 octane).
As an FYI, you will actually notice a huge difference in fuel economy by doing this. Higher Octane = more power = more efficiency = better mileage.