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.
-------------------------MORE INFORMATION Octane + E10 Fuels----------------------------. An octane number is a measure of gasoline's ability to resist pre-ignition, also known as knocking or pinging. Octane is a rating, similar to a ratio of measurement, not a substance chemical or product you can add to gas. When E10 gas phase-separates (high octane ethanol drops to the bottom of the tank with water), the upper tank layer octane typically drops 2.5 points. 2  E.G. 87 octane gas purchased now becomes sub-octane 84.5 gasoline.