Island relating to the duties and responsibilities of the Director for the waters of the state, and in. accordance with the requirements of Chapter 42-35, Administrative Procedures Act. Rule 3. - SUPERSEDED RULES. Upon adoption, these rules and regulations will supersede Water Quality Regulations for Water Pollution.
Using low octane fuel in a high octane engine will result in severely reduced performance because the engine will attempt to adjust to the lower octane gasoline. In extreme cases, or with prolonged use of low octane gasoline in these engines, pinging or pre-detonation can occur and can eventually destroy your engine.
I should clarify that I'm asking about putting 87 or 89 octane gas from Mobil/Shell/BP etc, not gas from a second rate station. So far what I have been doing is putting in half 93 octane and half 89 octane in order to get 91 octane since they don't sell straight 91 octane in my area (except for Sunoco). I have experienced fuel system problems with inferior gas with a previous vehicle which is why I switched to Mobil/Shell/BP etc.