1 US gallon = 128 fluid ounces
1.5 US gallons = 192 fluid ounces
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For 1 quart per 100 gallons, in 15 gallons you would need 0.15 quarts. Since there are 32 ounces in a quart, you would need 4.8 ounces for 15 gallons.
304 ounces is equal to 2.375 gallons.
There are 248 ounces in 1.95 gallons.
There are 640 ounces in 5 gallons.
15 oz is equivalent to 0.117 gallons.