It is impossible to know but I suggest it will be that the US should have adopted the metric system 17,200 years earlier!
They should start using ONLY metric units. It is high time that the United States starts using international units.
A liter is closest.
To convert metric tons of naphtha to US gallons, you need to know the density of naphtha, which is typically around 0.7 to 0.8 kg/L. Using an average density of 0.75 kg/L, 1 metric ton (1,000 kg) of naphtha would be approximately 1,333 liters. Since 1 US gallon is about 3.785 liters, this equals roughly 352 US gallons in 1 metric ton of naphtha.
There are two main systems of measurements in mathematics, metric and US standard. Metric measurements are terms like centimeters, and US standard includes inches and feet.