- Joined
- Aug 9, 2010
- Location
- Coral Springs, Florida
What octane rating do you use for your outboard when fueling up? I read the Mercury information and it said anything over 87 unleaded. However, if you put high test in there would it tend to run cleaner and leave less deposits to protect your outbioard in the long run? Also it seems that the high test would improve fuel efficiency (it seems to in my car). I'm using the term high test to mean the 91 octance stuff.