Surface Water. COCKREHAM ISLAND BUY-OUT FEASIBILITY STUDY. The Cockreham Island Flood Hazard Reduction Buy-Out Study: Cockreham Island is located between the Towns of Lyman and Hamilton, in Skagit County, Washington, and is adjacent to the Skagit River.
And we certainly see a decrease in NOx without a significant increase in HC or CO. So, in some instances, buying a slightly higher octane fuel can both increase performance and help pass a failed emissions test. Generally, yes, spending money on higher octane than your owner's manual recommends is a waste of money. But sometimes ethanol tilts the scales. Of the 6 vehicles I've owned, 2 benefited from slightly higher octane-the other 4 suffered.
But take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage, or run cleaner. Your best bet: listen to your owner's manual. The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars.