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1 US gallon = 3.7854118 liters Here in southern Minnesota its $3.20/gallon of 87 octane. So that would be $0.85/liter 1 € = 1.3488 US$ 1 US$ = 0.741399763 € So one liter of crap 87 octane is 0.63€ (if i did the math right?)