Enter the total number of gallons of gas a car can hold and the total mileage it can travel with a full tank to determine the fuel efficiency.

Fuel Efficiency Formula

The following formula is used to calculate the fuel efficiency of a car. 

E = TM / TG
  • Where E is the fuel efficiency (miles per gallon) (mpg)
  • TM is the total miles traveled on one tank of gas
  • TG is the total gallons of gas held by a full tank

To calculate the fuel efficiency, divide the miles traveled on one tank of gas by the total gas tank size in gallons.

Fuel Efficiency Definition

Fuel efficiency is defined as the total miles per gallon of fuel that a car can travel. Fuel efficiency is used to describe how efficiently a car takes fuel and converts it into movement.

How to calculate fuel efficiency?

Example Problem #1:

First, determine the total gallons the car can hold. For this example, the car holds 20 gallons of gasoline as fuel.

Next, drive the car from full all the way to empty and record the distance. In this problem, the car traveled 300 miles.

Finally, calculate the fuel efficiency using the formula:

E = TM / TG

= 300 / 20

= 15 MPG.

FAQ

What factors can affect a car's fuel efficiency?

Several factors can influence a car's fuel efficiency, including the car's design, weight, engine size, and aerodynamics. Driving habits, such as speeding, rapid acceleration, and frequent braking, can also significantly impact fuel efficiency. Additionally, the use of air conditioning and carrying heavy loads can decrease a car's miles per gallon (MPG).

How can I improve my car's fuel efficiency?

Improving a car's fuel efficiency can be achieved through regular maintenance, such as ensuring tires are properly inflated, using the recommended grade of motor oil, and keeping the engine tuned. Adopting smoother driving habits, avoiding excessive idling, and reducing the use of air conditioning can also help increase fuel efficiency. Additionally, removing unnecessary weight from the car can lead to better MPG.

Why is calculating fuel efficiency important?

Calculating fuel efficiency is important for several reasons. It helps drivers understand how much it costs to operate their vehicle over distances, allowing for better budgeting and planning. Knowing a car's MPG can also guide purchasing decisions, as more fuel-efficient vehicles tend to have lower fuel costs over time. Additionally, understanding and improving fuel efficiency can contribute to reducing environmental impact by lowering carbon emissions associated with fuel consumption.