
U-Haul trucks, a popular choice for DIY movers and small businesses, primarily use unleaded gasoline as their fuel source. This makes them convenient for renters, as gasoline is widely available at most fuel stations across the country. However, U-Haul also offers a limited number of diesel-powered trucks, typically for larger or long-distance moves, as diesel engines are known for their fuel efficiency and torque. When renting a U-Haul truck, it’s essential to confirm the fuel type with the rental location to ensure proper refueling and avoid potential issues during your move.
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What You'll Learn

Gasoline vs. Diesel
U-Haul trucks primarily use gasoline or diesel fuel, depending on the model and size of the vehicle. Smaller trucks, like the 10-foot and 15-foot models, typically run on gasoline, while larger trucks, such as the 20-foot and 26-foot models, are often diesel-powered. This distinction is crucial for renters, as it affects fuel efficiency, cost, and performance. Understanding the differences between gasoline and diesel can help you make an informed decision when choosing a U-Haul truck for your move.
Analytical Perspective:
Gasoline engines operate on a spark-ignition system, where fuel is mixed with air and ignited by a spark plug. This design makes gasoline engines lighter and generally less expensive to manufacture, which is why smaller U-Haul trucks often use them. Diesel engines, on the other hand, use compression ignition, where air is compressed to a high temperature, causing the fuel to ignite. This process is more efficient, allowing diesel engines to achieve better fuel economy, especially over long distances. For instance, a diesel-powered 26-foot U-Haul truck can travel up to 10 miles per gallon, compared to 8 miles per gallon for a gasoline-powered 15-foot truck. However, diesel fuel is typically more expensive than gasoline, and diesel engines require more robust (and costly) construction.
Instructive Approach:
If you’re renting a U-Haul truck, knowing the fuel type is essential for budgeting and planning. For gasoline trucks, use regular unleaded fuel (87 octane), which is widely available at most gas stations. For diesel trucks, ensure you use ultra-low sulfur diesel (ULSD), as it’s required by law and better for the engine. Always refuel before returning the truck to avoid additional fees. Pro tip: Use a fuel rewards app or plan your route to find the cheapest gas stations along your journey. Additionally, diesel trucks have a higher torque, making them better suited for heavy loads or hilly terrain, so consider your cargo weight and route when choosing between the two.
Comparative Analysis:
Gasoline and diesel fuels differ in cost, availability, and environmental impact. Gasoline is generally cheaper per gallon and more readily available, making it a convenient choice for shorter moves or urban areas. Diesel, while more expensive, offers better fuel efficiency and lower CO2 emissions per mile, making it a greener option for long-distance hauls. However, diesel engines produce more nitrogen oxides (NOx) and particulate matter, which can be harmful to air quality. If sustainability is a priority, consider the trade-offs: diesel’s efficiency may offset its higher cost and emissions in certain scenarios.
Descriptive Insight:
Imagine you’re driving a U-Haul truck across the country. If you’re in a gasoline-powered 15-foot truck, you’ll likely stop for fuel more frequently due to lower efficiency, but each stop will cost less. In contrast, a diesel-powered 26-foot truck will require fewer stops, saving you time, but each refueling will be pricier. The diesel engine’s rumble and robust performance will be noticeable, especially when climbing steep grades or towing heavy loads. Gasoline engines, while quieter and smoother, may struggle under similar conditions. Your choice ultimately depends on your trip’s specifics: distance, terrain, and budget.
Persuasive Argument:
For most U-Haul renters, the decision between gasoline and diesel boils down to practicality. If you’re moving locally or have a light load, a gasoline truck is the simpler, more cost-effective choice. However, for long-distance moves or heavy cargo, diesel’s efficiency and power make it the smarter investment. While the upfront fuel cost is higher, the savings in fewer refuels and better performance can outweigh the expense. Always check U-Haul’s fuel recommendations for your specific truck model and plan accordingly to avoid unnecessary stress on moving day.
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Fuel Efficiency Tips
U-Haul trucks primarily use unleaded gasoline or diesel fuel, depending on the model and size of the vehicle. For smaller trucks like the 10-foot and 15-foot models, unleaded gasoline (87 octane) is the standard. Larger trucks, such as the 20-foot and 26-foot models, typically run on diesel fuel. Understanding the fuel type is the first step, but maximizing fuel efficiency is crucial for reducing costs and environmental impact during your move.
Analytical Insight: Fuel efficiency in U-Haul trucks is heavily influenced by driving habits and vehicle maintenance. Studies show that aggressive driving—rapid acceleration and braking—can reduce fuel efficiency by up to 33% at highway speeds and 5% in city conditions. Maintaining a steady speed, especially on highways, can significantly improve mileage. For example, driving at 55 mph instead of 65 mph can increase fuel efficiency by 15%. Additionally, ensuring proper tire inflation is critical; underinflated tires can lower gas mileage by 0.3% for every 1 PSI drop in pressure.
Instructive Steps: To enhance fuel efficiency, start by planning your route to avoid heavy traffic and steep inclines. Use cruise control on highways to maintain a consistent speed. Reduce excess weight by only packing what’s necessary; every 100 pounds of extra cargo decreases fuel efficiency by about 1%. Keep the truck’s windows closed at high speeds to minimize drag, and remove roof racks or cargo carriers when not in use. Regular maintenance, such as oil changes and air filter replacements, ensures the engine operates optimally. For diesel trucks, consider using fuel additives to improve combustion and reduce emissions.
Comparative Perspective: Gasoline-powered U-Haul trucks generally have lower fuel efficiency than diesel models, but they are easier to refuel due to the widespread availability of gasoline stations. Diesel trucks, while more fuel-efficient, require access to diesel pumps, which can be less common in certain areas. For long-distance moves, diesel trucks may save more on fuel costs despite the higher price per gallon. However, gasoline trucks are often more cost-effective for shorter trips. Comparing the two, diesel’s higher torque also makes it better suited for hauling heavy loads over hilly terrain.
Persuasive Argument: Investing time in fuel-efficient practices not only saves money but also reduces your carbon footprint. For instance, idling a U-Haul truck for just 10 minutes wastes about one-tenth of a gallon of fuel. Turning off the engine when stopped for extended periods can prevent unnecessary fuel consumption. Additionally, carpooling or consolidating trips can further minimize environmental impact. By adopting these habits, you contribute to sustainability while keeping moving costs down.
Descriptive Example: Imagine a family moving from Los Angeles to San Francisco in a 20-foot U-Haul truck. By maintaining a steady 55 mph, avoiding rush hour, and ensuring proper tire inflation, they could save up to $50 in fuel costs for the 400-mile trip. Adding a fuel additive to the diesel tank improves mileage by 5%, saving an additional $10. These small changes not only make the journey smoother but also demonstrate how mindful practices lead to tangible benefits.
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Best Fuel for Long Hauls
U-Haul trucks, like many rental vehicles, primarily run on unleaded gasoline, specifically 87 octane. However, for long hauls, the choice of fuel isn’t just about compatibility—it’s about efficiency, cost, and performance. While gasoline is standard, diesel emerges as a superior option for extended trips, particularly in larger trucks. Diesel engines are inherently more fuel-efficient, delivering up to 30% better mileage than gasoline counterparts. For a 1,000-mile trip, this could translate to saving 50–70 gallons of fuel, depending on the truck’s size and load. Additionally, diesel’s higher energy density means fewer stops for refueling, a critical advantage when time is of the essence.
However, not all U-Haul trucks are diesel-compatible, so it’s essential to verify the engine type before fueling. If you’re driving a gasoline-powered truck, focus on premium gasoline (89–93 octane) for long hauls. While it’s pricier, premium fuel can improve engine performance and reduce knocking, especially under heavy loads or in high temperatures. For example, a fully loaded 26-foot U-Haul truck hauling cross-country will benefit from the added stability of premium fuel, potentially preventing engine strain and costly repairs. Always check the owner’s manual or consult U-Haul staff to confirm the recommended octane level.
For those prioritizing sustainability, biodiesel blends (e.g., B20, which is 20% biodiesel and 80% petroleum diesel) are worth considering if your truck is diesel-equipped. Biodiesel reduces carbon emissions by up to 80% compared to pure diesel, making it an eco-friendly choice for long hauls. However, ensure the truck’s engine is compatible with biodiesel to avoid damage. Practical tip: Use fuel apps like GasBuddy to locate biodiesel stations along your route, as availability can be limited in certain regions.
Lastly, regardless of fuel type, proper maintenance is key to maximizing efficiency on long hauls. Keep tires inflated to the recommended PSI (typically 80–90 for U-Haul trucks), and ensure the air filter is clean to optimize combustion. For diesel trucks, monitor the exhaust fluid (DEF) levels, as this is required for emissions compliance. Pro tip: Plan your route to include rest stops with fueling stations, and fill up during off-peak hours to avoid delays. By combining the right fuel with smart driving habits, you’ll ensure a smoother, more cost-effective long-haul journey.
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Alternative Fuel Options
U-Haul trucks, like many in the moving industry, traditionally rely on gasoline or diesel fuel. However, the push for sustainability and cost-efficiency has sparked interest in alternative fuel options. These alternatives not only reduce environmental impact but also offer long-term savings for both the company and consumers. Let’s explore some viable options that could reshape the future of U-Haul’s fleet.
Electric Vehicles (EVs): A Clean, Quiet Revolution
Electric trucks are gaining traction in the commercial sector, and U-Haul could benefit significantly from this shift. EVs produce zero tailpipe emissions, making them ideal for urban areas with strict air quality regulations. While the upfront cost of electric trucks is higher, the total cost of ownership decreases over time due to lower fuel and maintenance expenses. For instance, Tesla’s Semi truck claims a range of up to 500 miles on a single charge, suitable for most local and regional moves. U-Haul could start by deploying EVs in densely populated cities, leveraging existing charging infrastructure while contributing to cleaner air.
Propane Autogas: A Proven, Low-Emission Choice
Propane autogas is another alternative fuel with a strong track record in fleet operations. It burns cleaner than gasoline or diesel, reducing greenhouse gas emissions by up to 25% and virtually eliminating particulate matter. Propane-powered trucks also have a lower total cost of ownership due to fuel savings and reduced maintenance needs. U-Haul could retrofit existing vehicles with propane systems or invest in new propane-ready models. This option is particularly appealing for rural areas where electric charging stations are scarce but propane refueling stations are more readily available.
Renewable Diesel: A Drop-In Solution
Renewable diesel, made from organic materials like vegetable oils and animal fats, is chemically identical to petroleum diesel but produces up to 80% less lifecycle emissions. It requires no engine modifications, making it a seamless transition for U-Haul’s existing diesel fleet. While the cost of renewable diesel is slightly higher than conventional diesel, its environmental benefits and compatibility with current infrastructure make it a practical choice. Companies like UPS and FedEx have already incorporated renewable diesel into their fleets, proving its effectiveness in large-scale operations.
Hydrogen Fuel Cells: The Long-Haul Innovator
Hydrogen fuel cell technology offers a promising solution for long-distance hauling. These vehicles emit only water vapor and can refuel in under 10 minutes, addressing the range and downtime concerns of battery-electric trucks. However, the high cost of hydrogen infrastructure and limited refueling stations remain significant barriers. U-Haul could pilot hydrogen fuel cell trucks on specific routes where refueling stations are available, such as along major highways or in partnership with hydrogen hubs. This approach would position the company as a leader in cutting-edge sustainable transportation.
Biodiesel Blends: A Simple, Immediate Step
For a quick and cost-effective transition, U-Haul could adopt biodiesel blends like B20 (20% biodiesel, 80% petroleum diesel). These blends reduce emissions without requiring engine modifications and are compatible with existing fuel infrastructure. Biodiesel is made from renewable resources like soybean oil or recycled cooking grease, making it a sustainable option. While not as clean as renewable diesel or electric, biodiesel blends offer an immediate way to lower the carbon footprint of U-Haul’s fleet while exploring more advanced alternatives.
By embracing these alternative fuel options, U-Haul can reduce its environmental impact, lower operating costs, and meet the growing demand for sustainable moving solutions. Each option presents unique advantages, and a strategic combination of these fuels could create a diversified, future-proof fleet.
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Fuel Tank Capacity Guide
U-Haul trucks primarily use unleaded gasoline or diesel fuel, depending on the model. Understanding the fuel tank capacity of your rental truck is crucial for planning long hauls, budgeting for fuel costs, and avoiding unexpected stops. For instance, the popular 10-foot U-Haul truck typically has a fuel tank capacity of 31 gallons, while the larger 26-foot truck can hold up to 60 gallons. Knowing these specifics ensures you’re prepared for your journey.
When renting a U-Haul, start by identifying the exact model and its fuel type. Gasoline-powered trucks are more common for smaller sizes, while diesel is often reserved for larger, heavier-duty models. To estimate fuel costs, calculate the distance of your trip and the truck’s average miles per gallon (MPG). For example, a 15-foot truck averages 10-12 MPG, so a 300-mile trip would require approximately 25-30 gallons of fuel. Always factor in extra for detours or traffic delays.
A practical tip for maximizing fuel efficiency is to avoid overloading the truck and maintain a steady speed. Rapid acceleration and braking can significantly reduce MPG. Additionally, ensure the truck is properly maintained, as issues like underinflated tires or a dirty air filter can impact fuel consumption. If you’re renting a diesel truck, note that diesel fuel is generally more expensive but offers better efficiency for long hauls.
For those planning cross-country moves, consider refueling at cost-effective locations. Apps like GasBuddy can help locate cheaper fuel stations along your route. Keep a fuel log to track expenses, especially if you’re deducting moving costs for tax purposes. Finally, always return the truck with the fuel level matching the rental agreement to avoid additional charges. Understanding and managing fuel tank capacity transforms a potentially stressful move into a well-organized journey.
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Frequently asked questions
Most U-Haul trucks use unleaded gasoline, typically 87 octane or higher, depending on the specific model.
Yes, some larger U-Haul trucks, such as the 26-foot models, use diesel fuel instead of gasoline.
Yes, U-Haul trucks can use ethanol-blended gasoline (E10) but do not recommend using higher ethanol blends like E15 or E85, as they may damage the engine.











































