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An octane index can be of great service in the blending of gasoline. Motor gasoline, as marketed, is usually a blend of several types of refinery grades that are derived from different processes such as straight-run gasoline, reformate, cracked gasoline etc. These different grades are blended in amounts that will meet final product specifications.
Most states do not mandate certain standard gasoline grade octane ratings.In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2".All states require gas pumps to be labeled with the correct octane level and nearly all states do regular testing to make sure gas stations are in compliance.
Gasoline marketers agree when they sign on to Top Tier program that all their grades of gasoline meet these standards. [10] However, premium grade gasoline may have yet higher levels of detergent additives. [11] Typically, Top Tier gasoline will contain two to three times the amount of detergent additives currently required by the EPA. [12]
Though gasoline is a naturally colorless liquid, many gasolines are dyed in various colors to indicate their composition and acceptable uses. In Australia, the lowest grade of gasoline (RON 91) was dyed a light shade of red/orange, but is now the same color as the medium grade (RON 95) and high octane (RON 98), which are dyed yellow. [46]
In small two-stroke engines, the oil may be pre-mixed with the gasoline or fuel, often in a rich gasoline: oil ratio of 25:1, 40:1 or 50:1, and burned in use along with the gasoline. Larger two-stroke engines used in boats and motorcycles may have a more economical oil injection system rather than oil pre-mixed into the gasoline.
Inadequate gas quality can impact your car’s ability to pass a smog check, if the check engine light is due to incomplete combustion, according to Dillan. Reduced Fuel Efficiency.
Gasoline prices go from 36 cents a gallon in 1972 to over 50 cents a gallon in 1973. March 18, 1974 - At an OPEC meeting, seven members lift the ban on exports to United States.
Octane is a component of gasoline and petroleum. Under standard temperature and pressure, octane is an odorless, colorless liquid. Like other short-chained alkanes with a low molecular weight, it is volatile, flammable, and toxic. Octane is 1.2 to 2 times more toxic than heptane. [5]