A Comprehensive Guide on Understanding Fleet Fuel Efficiency
January 24, 2023

A Comprehensive Guide on Understanding Fleet Fuel Efficiency

Fuel consumption is a major consideration for large-scale fleet operators, either for commercial or private use. As fuel prices continue to fluctuate, managing a fleet to maximize efficiency often proves to be an especially complex challenge. Fleet owners must have a good understanding of fuel consumption and the different elements that contribute to it when formulating strategies in order to achieve maximum operational efficiency. These elements include the type of vehicles used and their driver’s behaviors behind the wheel, making necessary adjustments based on the real-time results of driving operations. This article will provide a comprehensive guide on understanding and improving your fleet's fuel efficiency – useful tips, best practices and data analysis insights that can help operators save money in the long run as well as make better decisions when purchasing new vehicles or adopting new technologies.

What is fuel efficiency?

Fuel efficiency is an important measure of how much energy a vehicle can extract from fuel. It is affected by many factors such as the type of vehicle, driving style, age, maintenance, and rolling resistance. In order to improve the fuel efficiency of a fleet, changes are required at the driver and vehicle levels.

The Environmental Protection Agency sets fuel efficiency standards at a federal level to reduce reliance on foreign oil and lower gas prices. These standards are enforced at the state level to improve engine technology and create more fuel-efficient vehicles.

How do you calculate fuel efficiency?

Fuel consumption is the measure of how efficiently a vehicle uses fuel, and it can be calculated using the formula Fuel used / Distance traveled. The result of this calculation depends on the metric units used as input, such as miles or kilometers.

The fuel consumption calculator can be used to determine the fuel cost per mile or km, as well as miles per $ / km per $. This information can be useful in predicting expenses for future trips. Fuel economy quantifies a car's efficiency by how far it travels using a certain amount of fuel. Knowing the fuel consumption rate will help drivers understand how much fuel their vehicle burns at a certain distance and make informed decisions about their driving habits.

1. Calculate the total weight of the truck, including cargo and passengers.

2. Determine the average speed of the truck over a given distance.

3. Calculate the amount of fuel used during that distance by multiplying the total weight of the truck by its average speed.

4. Divide the amount of fuel used by the total distance traveled to calculate fuel efficiency in miles per gallon (MPG).

For example, let’s suppose you completely fill an empty 150-gallon tank and drive 800 miles before having to refuel.

As a result, your fuel efficiency for this truck is 5.3 mpg (800 miles/150 gallons).

‍The average mpg for a semi-truck is 6.5 mpg. Anything higher than this is considered excellent, while anything lower is considered below average. However, various factors may impact this figure.

Cost Per Mile is useful to determine the cost of operating a vehicle over a certain distance.

For example, Cost Per Mile =  $3/6.5 = $0.45 (Cost per Gallon/MPG)

To calculate a truck's fuel efficiency, fleet managers should use a fuel efficiency calculator. This calculator takes into account the weight of the truck, its engine size, and other factors to determine how much fuel it will consume per mile. The calculator also considers the type of terrain being driven on, as well as the speed at which the truck is traveling. By entering these details into the calculator, fleet managers can get an accurate estimate of the truck's fuel efficiency.

Factors affecting Fuel Efficiency

Fleet fuel efficiency is a major challenge for companies managing fleets, as fuel costs make up a large portion of operating expenses. The fuel economy of each vehicle is an important factor in determining overall fleet fuel efficiency, as well as its aerodynamics and combustion engine efficiency.

The top 5 factors that affect a vehicle's fuel efficiency are given below

1. Choosing the right Vehicle

Fleet vehicles come in a variety of shapes and sizes, from cars to vans and trucks. The weight of these vehicles can have a significant impact on their fuel efficiency, with lighter vehicles being more fuel-efficient than heavier ones. Unfortunately, many fleet managers make the mistake of using the wrong type of vehicle for their needs, resulting in lower fuel efficiency and increased cost-effectiveness.

The National Highway Traffic Safety Administration (NHTSA) has implemented regulations regarding fuel efficiency for truck trailers. However, due to a court order issued on September 29th, 2020 in case No. 16-1430, the compliance dates for these regulations have stayed. This means that truck trailers are not currently required to meet the NHTSA’s fuel efficiency standards until further notice. Fleet managers should be aware of this when making decisions about which type of vehicle to use in their fleets.

2. Driver Behavior

Drivers have a major impact on fleet fuel efficiency, and it is important for fleet managers to motivate their drivers to adjust their driving styles in order to save fuel. Drivers should be trained to drive efficiently and adhere to speed limits in order to reduce the amount of fuel used. Fuel-efficient driving techniques, such as maintaining a constant speed, gentle acceleration, and braking in advance, can help reduce fuel costs. Most drivers do not practice these techniques, leading to minor losses for the fleet.

Encourage wise driving habits such as:

  • Maintaining a constant speed

Drivers should avoid sudden acceleration and deceleration, as this can cause the engine to work harder and consume more fuel. The most fuel-efficient speed is 65 mph. 

  • Smoother braking for fuel efficiency

Braking too hard or too late can lead to more fuel consumption.

  • Reduce idling

Idling for long periods of time can waste fuel and increase emissions.

  • Efficient shifting techniques

Drivers should shift gears at the lowest possible engine speed, as this will reduce fuel consumption.

  • Reducing idling

Prolonged idling of a vehicle for more than two minutes can significantly increase fuel consumption.

  • Follow Gear Ratio

Drivers should be aware of their vehicle's recommended gear ratios for different speeds and terrain types in order to ensure they are using the most efficient gear for their current situation.

Fleet managers should invest in driver training or monitoring programs. These programs can improve fuel efficiency by up to 20%. Electronic engine monitors can be installed to track performance and driving behaviors for each vehicle. This will allow fleet managers to monitor driver behavior and make necessary adjustments in order to maximize fuel efficiency.

3. Poor Route Optimization

Poor route optimization can have a significant impact on the efficiency of a fleet. When routes are not optimized, drivers may take longer routes that consume more fuel and lead to increased costs for the company. Furthermore, delivery times can be extended due to inefficient routing, leading to customer dissatisfaction. To avoid these issues, companies must plan optimal routes that consider the destination, fuel requirements, load, and other factors.

4. Vehicle Maintenance

Vehicle maintenance is also essential for the efficient use of fuel; adhering to a preventative maintenance schedule and addressing small issues quickly can help ensure vehicles are running at peak performance. Poorly maintained vehicles will consume more fuel, resulting in higher costs for the fleet. Fleet Maintenance software can help track the preventive maintenance schedule of fleet vehicles. Timely reminders are sent to ensure there is no delay in sending the vehicle for maintenance. 

5. Heavy Loads for fuel consumption

Heavy loads can also have a negative impact on fuel efficiency. Drivers should ensure that their vehicles are properly loaded and balanced to reduce drag and improve fuel efficiency. 


Fuel efficiency is an important measure of how much energy a vehicle can extract from fuel and is affected by many factors such as the type of vehicle, driving style, age, maintenance, and rolling resistance. Fleet managers should use a fuel efficiency calculator to determine their vehicle's fuel efficiency given the weight, engine size, and terrain drove on.

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