Tony J. answered 12/01/17
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You need 1 part oil for 32 parts gas. That's a total of 33 parts, which need to make up 5 gallons. Therefore, each part is 5/33 gallon. That's 20/33 quart, or 40/33 pint, or 80/33 cup, or 640/33 fl oz., which is about 19.4 fl oz. In other words, 2 cups + 3.4 fl oz.