When it comes to diesel fuel, not all types are created equal. At Rockingham Petroleum, we know our customers depend on reliable, high-quality fuel to keep everything from farm equipment to delivery trucks running smoothly. That’s why we offer both on-road and off-road diesel—and help you understand the difference so you can make the right choice for your equipment and budget.
What’s the Difference Between On-Road and Off-Road Diesel?
The main differences between these two types of diesel come down to where they’re used, how they’re taxed, and how they’re dyed. Let’s break it down:
On-Road Diesel (Clear Diesel)
- Also known as: highway diesel or ultra-low sulfur diesel (ULSD)
- Color: Clear
- Uses: Vehicles that are driven on public roads, such as trucks, buses, and delivery vans
- Taxed? Yes – includes state and federal taxes
- Regulations: Must meet EPA emission standards for on-road vehicles
On-road diesel is the standard fuel for any diesel-powered vehicle that operates on public roads. Because it’s taxed, it’s more expensive—but also legal for highway use. Using off-road diesel in a highway vehicle is illegal and can result in hefty fines.
Off-Road Diesel (Dyed Diesel)
- Also known as: red diesel
- Color: Dyed red to distinguish from taxed diesel
- Uses: Farm equipment, construction machinery, generators, and other non-highway-use engines
- Taxed? No – exempt from highway fuel taxes
- Regulations: Must still meet emissions standards for off-road use
Off-road diesel is chemically the same as on-road diesel, but it’s dyed red to indicate that it’s tax-exempt and for off-road use only. It’s a cost-effective fuel option for farms, construction sites, and other non-road applications.
Which One Do You Need?
Choosing the right diesel depends on where and how your equipment operates:
- On-road diesel for commercial trucks, delivery vans, and vehicles using public highways
- Off-road diesel for tractors, combines, excavators, skid steers, and stationary engines like generators and pumps
If you’re not sure which diesel your equipment requires, the team at Rockingham Petroleum is happy to help you figure it out.
Why Fuel with Rockingham Petroleum?
Whether you’re powering a single farm or managing a fleet of trucks, Rockingham Petroleum provides:
✔️ Top-quality diesel fuel
✔️ Reliable bulk delivery options for both on-road and off-road fuel
✔️ Additives and storage solutions to keep your fuel clean and your engines running efficiently
✔️ Expert guidance on fuel types, storage, and regulatory compliance
We proudly support our local farmers, contractors, and business owners with the fuel they need—delivered where and when they need it.
Need diesel fuel? Contact Rockingham Petroleum today to schedule a delivery or stop by one of our convenient locations.