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**Average Fuel Consumption** is a measure of how efficiently a vehicle uses fuel over a set period of time or distance. Here’s how it’s calculated in both the Imperial and metric systems:

**Imperial System**:

**Calculation**: The average fuel consumption is determined by dividing the total distance driven by the amount of fuel consumed.**Example**: If a car drives 12,000 miles in a year and consumes 500 gallons of fuel, the average fuel consumption would be:\[ \text{Average fuel consumption} = \frac{12,000 \text{ miles}}{500 \text{ gallons}} = 24 \text{ miles per gallon (mpg)} \]

**Metric System**:

**Conversion**: First, convert miles to kilometers and gallons to liters if necessary.- 12,000 miles = 19,312 kilometers
- 500 U.S. gallons = 1,894 liters

**Calculation**: In the metric system, fuel consumption is usually expressed as liters per 100 kilometers (l/100 km).- The calculation involves dividing the total liters of fuel by the total kilometers driven and then multiplying by 100:
\[ \text{Metric fuel consumption} = \frac{1,894 \text{ liters}}{19,312 \text{ kilometers}} \times 100 = 9.8 \text{ l/100 km} \]

- The calculation involves dividing the total liters of fuel by the total kilometers driven and then multiplying by 100:

This method allows for easy comparison of fuel efficiency across different systems of measurement.

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