Gasoline 91

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The mixture of hydrocarbons that make up this gasoline, popularly known as regular gasoline, provides it with volatility characteristics and a minimum octane rating of 91 to obtain an adequate performance in its use. As mentioned in previous years, lead in this gasoline was gradually reduced from 0.84 g Pb/L to 0.54 g Pb/L in 1994, and then the amount was reduced to an average of 0.20 g Pb/I in 1995.

Gasoline 91 Characteristics

Octane ratings are measures of fuel stability. These ratings are based on the pressure at which a fuel will spontaneously combust (auto-ignite) in a testing engine. The octane number is actually the simple average of two different octane rating methods—motor octane rating (MOR) and research octane rating (RON)—that differ primarily in the specifics of the operating conditions. The higher an octane number, the more stable the fuel. Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level:

Regular (the lowest octane fuel–generally 87)

Midgrade (the middle range octane fuel–generally 89–90)

Premium (the highest octane fuel–generally 91–94)

The Ideal Choice

Standard unleaded petrol (91)
Unleaded 91 petrol is the most common type of fuel, and can be found at pretty much every petrol station. Most cars will be able to use it, although you may find the more premium fuel to be more fuel efficient, depending on what car you have.

Points of Interest

A form of engine fuel having a performance similar to a mixture of isooctane and heptane in a ratio of 91:9.

Resembles its reference fuel, a mixture of isooctane and heptane in a ratio of 91:9.



Suitable to use in low-performance diesel engines.

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