What is the purpose of the tiny superscript 9 in the top right hand corner of gas station price displays?

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What is the purpose of the tiny superscript 9 in the top right hand corner of gas station price displays?

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It represents 9/10ths of a cent. Basically, it makes gas seem a little cheaper than it really is because they get a few more pennies with a fillup, and they get to round up to another whole penny at the end.

I worked at a gas station for almost 3 years, its definitely indicating that if the price says 2.50, it’s actually 2.509 but we dont have partial pennies

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