Why is milk measured in gallons and soda in liters?

Answer 1

This is because the Soda industries want to be able to transport their brands to other countries, in which most other countries use the metric system, and milk most likely cannot be transported.

Answer 2

Milk is traditionally measured in gallons in the United States because it is a common unit of measurement for liquid volume in the country. Soda, on the other hand, is often measured in liters because the metric system is commonly used for food and beverage measurements in many countries around the world.

Answer 3

since the largest consumer of gasoline is america, people got used to selling it in gallons instead of liters and it just stuck

petrol is measured in litres in every country except the U.S.A.

Answer 4

There is a good explanation for this on the regular wikipedia site: http://en.wikipedia.org/wiki/Metric_engine