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It would have been very interesting to see if the USA had converted to the metric system by the early 1980's (per original intent) what kind of measurements we'll be using.

For short lengths, we would be using a combination of millimeters and centimeters (millimeters for very short lengths, centimeters for measuring size of animals including human height).

For longer lengths, we would be using meters and kilometers (meters for shorter distances and kilometers for longer distances).

For weights, we would be using milligrams, grams and kilograms (milligrams for pharmaceutical amounts, grams for food weights and kilograms for everything else).

For cubic measurements, we would be using milliliters, cubic centimenters and liters (milliliters for small containers, cubic centimeters for gasoline/diesel engine displacement, and liters for larger containers).

The output of engines would be measured in kilowatts for horsepower output and Pascals/kiloPascals for torque.

For weather, we would be using the Celsius scale for temperature and millibars for air pressure (where 980 millibars is standard sea level air pressure).

Interestingly enough, Americans would probably NOT use liters/100 km for calculating fuel economy that is common in Europe. We would probably be like the Japanese, where fuel economy is calculated in kilometers/liter.