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It all averages out. Sometimes I don't have the money for a fill up, so I post in exactly 5 gallons or 10 gallons or whatever I can afford by the gallon mark [gallons don't change, dollar prices do] and then just remember to add it next time I actually fill up.
It always averages out.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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