The practice of tacking 9/10 of a cent on the end of a gas price goes back to a decades-old tax imposed by state and federal governments. It was supposed to expire but never did. Plus more about gas prices, U.S. oil reserves and gasoline in general.

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Why Is 9/10 Added to Gas Prices? — Plus More About Gasoline
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    Why Is 9/10 Added to Gas Prices?

    Why Is 9/10 Added to Gas Prices?

    In a country where people can't buy anything for a penny anymore, it seems odd to pull up to a gas station and see a fraction of a cent included in …

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