166.4
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For U.S. gallons, multiply by 128 to get ounces. For Imperial gallons (Canadian or British), multiply by 160. 13.2 U.S. gallons = 13.2 x 128 ounces = 1,689.6 ounces 13.2 Imperial gallons = 13.2 x 160 ounces = 2,112 ounces