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I found this interesting. Never thought about it before, but if you use a gas pump with one hose, the gas in the hose is whatever the last guy selected. If you're only buying a gallon for the mower, half your purchase is past the selector, in the hose and the pump.
I'm still using a Korean war era 5 gallon can that my father used, so I buy 4 - 5 gallons at a time, but I'm going to start going to the station with multiple hoses on the pump.
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