Today Aunt May's cows gave her 365 gallons + 380 = <<365+380=745>>745 gallons of milk.
She had 745 gallons - 612 gallons sold to the ice cream factory = <<745-612=133>>133 gallons of milk left.
Combined with the leftover from yesterday, Aunt May has 133 gallons + 15 gallons = <<133+15=148>>148 gallons of milk.
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