I think the shutoff for the gas pump is at the end of the hose where you put it into the gas tank. So when you pick a blend, how much of the previous person's selection is already in the hose? For example, if they pick 87 octane, then I pick 92, I get a hose full of 87 before 92. For a tank like my golf cart, it might be half of that gets the 87 before I get the 92 I'm paying for.
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Making mirrors is a job I can really see myself doing. 
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