4 ms·1 gal is about half that (3.8 liters)by bumby 2y ago1 gal is about half that (3.8 liters)ggm 2y agoUK/imperial gallon is 4.5l US gallon is 3.78l more people used to use imperial than US but now most commonwealth economies are metric.bumby 2y agoFair enough, but it seems per clear that the OP was referring to US gal but the math was just off by double.