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  2. List of U.S. states by standard octane ratings - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_by...

    lower octane gas can be sold if labeled as "sub-standard" or "sub-regular" [11] South Dakota: 85/87 87/89 91 85 octane must be sold with a warning label displayed at the pump. [12] 85 and 86 octane can be sold as regular fuel only in the counties of Butte, Custer, Fall River, Harding, Lawrence, Meade, Oglala Lakota, Pennington, and Perkins.

  3. Octane rating - Wikipedia

    en.wikipedia.org/wiki/Octane_rating

    The octane rating of gasoline is measured in a test engine and is defined by comparison with the mixture of 2,2,4-trimethylpentane (iso-octane) and normal heptane that would have the same anti-knocking capability as the fuel under test. The percentage, by volume, of 2,2,4-trimethylpentane in that mixture is the octane number of the fuel.

  4. Wobbe index - Wikipedia

    en.wikipedia.org/wiki/Wobbe_index

    EU directives on gas quality use 15 °C in accordance with ISO 13443 and ISO 6976. , is the density of air at standard conditions, is the molar mass of the gas and is the molar mass of air which is about 28.96 kg/kmol. . The Wobbe index is used to compare the combustion energy output of different composition fuel gases in an appliance (fire ...

  5. The Real Costs of High Gasoline Prices, in 3 Charts

    www.aol.com/news/2013-09-14-the-real-costs-of...

    In 1998, gas in my hometown was a whopping $0.98 per gallon. For a kid in high school, that was huge—I was able to afford to go places. Gas had hovered around $1.00 for years, and many of us ...

  6. Top Tier Detergent Gasoline - Wikipedia

    en.wikipedia.org/wiki/Top_Tier_Detergent_Gasoline

    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]

  7. Gasoline gallon equivalent - Wikipedia

    en.wikipedia.org/wiki/Gasoline_gallon_equivalent

    Gasoline gallon equivalent (GGE) or gasoline-equivalent gallon (GEG) is the amount of an alternative fuel it takes to equal the energy content of one liquid gallon of gasoline. GGE allows consumers to compare the energy content of competing fuels against a commonly known fuel, namely gasoline.

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