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"According to the American Petroleum Institute the gas-pump hose typically retains about <b>one third of a gallon of fuel</b>. So when you pump a couple gallons of 93-octane premium after the previous customer pumped 87-octane regular, your fuel load would be diluted (not to mention overpriced)."
<https://podbharti.com/articles/how-much-does-fuel-line-cost>