Ameer Randolph
Understanding the fuel efficiency of trucks is crucial for trucking companies to manage their expenses and ensure profitability. The fuel efficiency of a truck, or the number of miles it can travel per gallon of fuel, depends on various factors such as the weight of the vehicle and load, driving behaviour, terrain, and maintenance. Calculating the fuel cost per mile involves dividing the distance by the fuel efficiency to find the gallons of fuel consumed, and then multiplying that by the fuel price. With this information, trucking companies can make more informed decisions about load profitability and ways to optimize fuel efficiency and costs.
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What You'll Learn
Fuel efficiency: miles per gallon
Fuel efficiency is a measure of how many miles a vehicle can travel per gallon of fuel. The fuel efficiency of a truck depends on various factors, such as the weight of the vehicle and its load, the terrain, and driving behaviour.
On average, semi-trucks get about 6.5 miles out of every gallon of fuel. However, this performance varies depending on where and how the truck is driven, as well as the age of the truck. For example, a truck climbing a hill will consume more fuel than one on a flat road, as it requires more engine speed and power. Similarly, a heavily loaded truck needs to slow down significantly to navigate corners safely, and the acceleration required to regain speed will also increase fuel consumption.
The weight of a vehicle has a direct impact on fuel efficiency. Research by Smith Bros. shows that a 10% increase in gross vehicle weight can result in a 5% increase in fuel consumption. Therefore, heavier loads can significantly impact the fuel costs of a trip. Additionally, unlike passenger cars, heavy goods vehicles (HGVs) often lack aerodynamic features that reduce drag, which can further impact fuel efficiency.
There are ways to improve the fuel efficiency of a truck. Maintaining proper tyre pressure, reducing idling time, using cruise control, and avoiding aggressive driving can all help to increase fuel efficiency. For example, maintaining a steady speed and accelerating gradually can improve fuel economy by up to 33% on the highway and 5% around town. Newer vehicles with stop-start technology can also help save fuel by automatically turning off the engine when idle.
It is important for trucking companies to understand the fuel efficiency of their fleet to calculate fuel costs and profitability. By knowing the miles per gallon of their trucks, companies can make more informed decisions about fuel cards, fuel efficiency programs, and budgeting. Additionally, calculating fuel costs per mile can help companies evaluate the profitability of different loads and routes.
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Fuel price: cost per gallon
Fuel prices are a crucial aspect of trucking operations, with fuel making up around a quarter of a motor carrier's average operating costs. The price of fuel per gallon can vary widely depending on numerous factors, including location, time, currency fluctuations, and government policies. For example, in January 2025, state diesel fuel tax rates ranged from about 9 cents per gallon in Alaska to 92 cents per gallon in California.
The cost of diesel per gallon can be broken down into four main categories: crude oil, refining, distribution and marketing, and taxes. Crude oil typically accounts for the largest share of diesel's total cost and is influenced by supply and demand, market sentiments, and international trade policies. The cost of crude oil is volatile and can significantly impact the price of diesel fuel.
Other factors that can affect fuel pricing include distribution and marketing costs, refining costs, and taxes. Local, state, and federal taxes can contribute significantly to fuel costs and vary by region. Additionally, currency fluctuations can impact the purchasing power of countries, leading to variations in fuel prices globally.
It's worth noting that fuel prices for trucks can also be influenced by the vehicle's fuel efficiency, which is measured by how many miles a truck can travel per gallon of fuel. The fuel efficiency of a truck can be found in the vehicle's specifications or calculated based on past fuel consumption. Maintaining proper tire pressure, reducing idling time, using cruise control, and avoiding aggressive driving can all help improve a truck's fuel efficiency and, consequently, impact the overall fuel costs.
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Vehicle weight: heavier vehicles use more fuel
Vehicle weight has a significant impact on fuel consumption, with heavier vehicles generally using more fuel than lighter ones. This is because it takes more energy to get a heavier vehicle up to speed, and these vehicles often have bigger engines with more moving parts, resulting in greater fuel usage. Additionally, heavier vehicles tend to have larger cross-sectional areas, leading to increased air drag, which further reduces fuel efficiency.
Research by Smith Bros. supports this, showing that a 10% increase in gross vehicle weight can lead to a 5% increase in fuel consumption. Similarly, EPA figures indicate that adding 100 pounds to a vehicle's weight decreases its fuel economy by about 1%. This relationship between weight and fuel consumption is also evident in trucks, with larger trucks consuming more fuel per mile than smaller ones. For example, a small truck with a payload of 16 tonnes consumes around 25 litres of diesel per 62 miles, while a larger truck with a payload of 23.5 tonnes can use up to 38 litres of diesel for the same distance.
The weight of the fuel itself also contributes to the overall weight of the vehicle. Gasoline weighs about 6 pounds per gallon, while diesel weighs approximately 7 pounds per gallon. Therefore, a vehicle with a full fuel tank will be heavier and have slightly lower fuel efficiency than the same vehicle with a half-full tank.
While weight is a significant factor in fuel efficiency, other factors also come into play. For instance, the age and maintenance of a vehicle, as well as its tires and the routes driven, can impact fuel consumption. Additionally, driving habits, such as aggressive driving, sudden starts and stops, and idling, can also affect fuel economy. Maintaining a steady speed, accelerating gradually, and using cruise control can help improve fuel efficiency.
In summary, while heavier vehicles generally use more fuel than lighter ones, optimising driving habits and vehicle maintenance can help mitigate the impact of weight on fuel consumption.
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Route: hills and corners reduce efficiency
The fuel efficiency of a truck depends on a variety of factors, including the route taken. Hills and corners can significantly reduce a truck's fuel efficiency.
When a truck goes up a hill, its engine needs to work harder to generate more power, which increases fuel consumption. The loss in fuel efficiency is further compounded if the truck is heavily loaded. According to ConMet, large trucks driving hilly routes can experience a drop in fuel economy of more than half. Additionally, elevation plays a role in fuel efficiency. At higher elevations, there is less oxygen available to the engine, causing the fuel to burn less efficiently. This lack of oxygen also makes the engine work harder, further reducing fuel efficiency.
Cornering also affects fuel efficiency. When a truck navigates a corner, especially when heavily loaded, it needs to slow down significantly. Regaining speed after slowing down requires acceleration, which consumes a considerable amount of fuel. Therefore, cornering can lead to higher diesel consumption per mile.
Aerodynamics also play a crucial role in fuel efficiency. Trucks with better aerodynamics experience reduced drag, resulting in less air resistance. This, in turn, improves fuel efficiency. Rounding corners can help in this regard, reducing drag by up to 54% and fuel consumption by up to 25%. Trailer tails, side skirts, and fairings are examples of aerodynamic features that can be added to trucks to improve airflow and reduce drag.
Cruise control is another feature that can help improve fuel efficiency on relatively flat, long stretches of highway. However, it should be avoided on hilly roads and uneven terrain.
Overall, the impact of hills and corners on fuel efficiency can be mitigated to some extent through various means, but they still pose significant challenges in optimizing fuel consumption for trucks.
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Driving style: aggressive driving reduces efficiency
Driving a truck efficiently is a complex task that requires a combination of skills, knowledge, and experience. One of the critical aspects of efficient truck driving is adopting a driving style that minimizes fuel consumption. Aggressive driving behaviours, such as speeding, rapid acceleration, and hard braking, can significantly impact fuel efficiency and lead to higher fuel costs.
Aggressive driving has been characterized by speeding, rapid acceleration, and late, hard braking. These behaviours not only increase the risk of crashes and damage the public image of the trucking industry but also result in higher fuel consumption. Speeding is a significant contributor to increased fuel consumption. For example, a truck travelling at 75 mph uses 27% more fuel than at 65 mph. As fuel is the second-highest cost for most truck fleets, right after driver pay, aggressive driving behaviours can substantially impact overall expenses.
Additionally, aggressive driving can lead to a reduction in fuel economy. Analysis by the Massachusetts Institute of Technology reveals that aggressive driving can lower fuel economy by 15%–30% on highways and 10%–40% in stop-and-go traffic. This decrease in fuel efficiency not only increases fuel costs but also negatively affects the profitability of trucking companies and owner-operators.
To improve fuel efficiency and reduce aggressive driving behaviours, fleet managers can implement driver training programs. These programs can educate drivers about the negative consequences of aggressive driving and teach fuel-efficient practices. By adopting a more sensible driving style, characterized by maintaining a steady speed, gradual acceleration, and avoiding sudden stops, drivers can improve fuel economy by up to 33% on highways and 5% in city driving.
Furthermore, utilizing technology such as telematics and video safety systems can provide valuable insights into driving behaviours and help identify areas for improvement. By analyzing data on speed, acceleration, and braking patterns, fleet managers can work with drivers to develop more fuel-efficient practices. Additionally, proper route planning and maintaining optimal tyre pressure can further enhance fuel efficiency and reduce overall fuel consumption.
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Frequently asked questions
To calculate your truck's fuel efficiency, divide the distance travelled by the amount of fuel consumed. You can then divide the fuel price per gallon by your truck's miles per gallon to get the price per mile.
A truck's fuel efficiency will vary depending on the weight of the vehicle, the weight of its load, the terrain, the driving style, and the age of the truck. On average, semi-trucks get about 6.5 miles out of every gallon of fuel. Small trucks with a payload of around 16 tonnes use roughly 25 litres of diesel per 62 miles.
To improve your truck's fuel efficiency, you can maintain proper tyre pressure, reduce idling time, use cruise control, avoid aggressive driving, and keep your truck well-maintained with regular servicing.
The average cost of fuel per mile for a truck will depend on the factors affecting its fuel efficiency, as well as the price of fuel. On average, a truck owner can expect to pay around \$0.36 per mile, with some sources giving a range of \$0.36 to \$0.50 per mile.
Aside from fuel, other costs to consider when running a truck include driver salary, repairs and maintenance, insurance, tyres, and overheads such as building costs, energy, phones, internet, and office support.
