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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesShort answer: Biodiesel can make financial and operational sense for a truck fleet, but only at a blend your specific engines approve and at a delivered price that works after fuel economy, freight, storage, cleaning, and seasonal costs. B5 is broadly treated as diesel fuel; B20 is a separate operating case that requires an engine-and-warranty check. Use current local supplier quotes and measured fleet consumption rather than a national average to decide.
What the blend labels mean
“Biodiesel” is not one uniform fuel. The letter B is followed by the percentage of biodiesel in a blend with petroleum diesel. That percentage changes the applicable fuel specification, vehicle approval question, handling requirements, and economics.
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| Fuel | Composition and specification | Typical fleet implication |
|---|---|---|
| B5 | Up to 5% biodiesel. ASTM D975 permits a blend up to B5 to be sold as diesel fuel without separate biodiesel labeling. | Low-level blend generally approved for diesel engines designed for petroleum diesel, subject to the vehicle maker’s documentation. |
| B20 | 6% to 20% biodiesel. The finished blend must meet ASTM D7467. | Common fleet blend that balances price, cold-weather performance, and compatibility, but approval must be verified for each engine and model year. |
| B100 | Neat biodiesel, with no petroleum diesel in the finished fuel. | Usually purchased as blendstock for lower-level blends and less commonly used as a routine transportation fuel. |
The practical difference between B5 and B20 is therefore not just 15 percentage points. B5 can fall under the conventional diesel specification, while B20 is a distinct fuel whose quality, warranty language, storage plan, and seasonal availability need to be reviewed.
Can my diesel truck run biodiesel?
Do not infer B20 approval from the fact that a truck has a diesel engine. The U.S. Department of Energy’s Alternative Fuels Data Center (AFDC) says all original-equipment manufacturers approve B5, while higher blends such as B20 require checking the OEM warranty; many engine manufacturers approve B20, but not all do.
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Check the exact vehicle before changing fuel
- Record the engine make and model, truck model, model year, and emissions configuration.
- Find the written owner’s manual, warranty terms, service bulletin, or OEM fuel-compatibility statement for that exact configuration.
- Confirm the approved blend range, required fuel specification, and any restrictions on storage, additives, filters, or temperature.
- Ask the dealer or manufacturer for written clarification when the documents are ambiguous, especially for older trucks, imported equipment, auxiliary engines, or mixed fleets.
- Keep the approval record with procurement and maintenance files so a fuel change does not outlive the documentation supporting it.
A B5 statement does not establish B20 approval. Conversely, a B20 approval does not automatically cover B100 or a blend above B20. Warranty language can be engine-specific, so a fleet should map approval by vehicle rather than adopt one rule for every truck.
Does biodiesel void a diesel engine warranty?
Using an approved fuel blend that meets the required specification should be evaluated under the OEM’s written warranty terms; using an unapproved blend or off-specification fuel can create a warranty dispute. There is no universal “biodiesel voids every warranty” rule and no universal B20 approval rule. The controlling question is what the manufacturer approves for the particular engine and model year.
For a defensible decision, retain the OEM approval, supplier certificate of analysis or equivalent quality documentation, purchase records, delivery dates, tank-cleaning records, and maintenance notes. Those records help distinguish a fuel-quality problem from an unrelated component failure if a claim arises.
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AFDC guidance says B20 and lower blends can generally be used in current engines without modifications when the blend is approved. B20 users typically see similar consumption, horsepower, and torque to petroleum diesel. B20 contains about 1% to 2% less energy per gallon than petroleum diesel, although many users report no noticeable difference in performance or fuel economy.
The energy-content figure is a broad fuel comparison, not a guaranteed change in every truck’s miles per gallon. Actual results depend on engine calibration, payload, terrain, idling, weather, driver behavior, maintenance, and the quality and consistency of the delivered fuel. Measure the fleet’s own gallons and miles before and after a controlled change rather than budgeting a universal mileage penalty.
What to measure during a trial
- Gallons purchased and miles traveled by vehicle and route.
- Fuel consumption during comparable payload, weather, and duty-cycle periods.
- Cold-start behavior, filter plugging, water handling, and unscheduled maintenance.
- Fuel-delivery interruptions, emergency purchases, and any route changes caused by supply limits.
- Net fuel cost per mile, including all fees and one-time preparation work.
Is B20 cheaper than diesel?
Sometimes, but the answer is local and time-sensitive. The Department of Energy Clean Cities and Communities Alternative Fuel Price Report for April 1–30, 2025 found B20 about $0.17 per gallon less than diesel on average during that reporting period. That is a dated, voluntarily submitted average—not a current quote for your fleet and not a guaranteed delivered savings.
The same report notes that contract prices vary with fleet size, purchase volume, distance from the supplier, and region. A smaller fleet near a distributor may receive a different price from a large fleet that buys by contract, and transport costs can erase a rack-price difference.
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Use delivered cost per mile, not a headline price
Request diesel and B20 quotes for the same location, delivery window, volume, payment terms, and tax treatment. Then calculate:
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Delivered cost per mile = (price per gallon × gallons used + recurring fees) ÷ miles traveled
Add one-time or periodic costs separately, then amortize them over the gallons or miles they support:
- Freight, minimum-drop charges, and supplier surcharges.
- Tank or line cleaning before the changeover.
- Filter replacement and additional inspections during the initial transition.
- Storage, blending, dispenser, or metering work.
- Permit, testing, or environmental-compliance costs required locally.
- Higher-cost emergency fuel if a planned biodiesel delivery is late or unavailable.
Do not treat the April 2025 $0.17 figure as a forecast. A fleet’s break-even price is the delivered B20 price at which its measured cost per mile equals the diesel baseline after these additions.
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Fuel quality, specifications, and supplier reliability
A price quote is incomplete without a quality and supply plan. Require the supplier to identify the finished-blend specification—ASTM D7467 for B20—and explain how biodiesel is sourced, blended, tested, and documented. Confirm who is responsible for water control, contamination response, and out-of-specification fuel.
Questions for a B20 supplier
- Can you deliver the contracted volume throughout the entire operating season?
- What are the normal lead times, minimum drops, and emergency-delivery options?
- How will the blend be protected from water, sediment, and cross-contamination?
- What quality documentation accompanies each load?
- How does the blend change with temperature, and what winter grade or seasonal plan is available?
- Which party pays for rejected loads, cleanup, or vehicle downtime caused by a specification failure?
Local availability is not uniform. A route network that crosses several states may need more than one approved supplier or a contingency plan for terminals where B20 is not offered.
Cold-weather and seasonal planning
B20 is often selected because it offers a compromise among cost, compatibility, and cold-weather performance. That does not mean every B20 formulation performs identically in winter or that every location can supply it at the same time. Ask the supplier for seasonal availability and the applicable low-temperature handling guidance for the blend being delivered.
Before winter operations, verify the planned blend for each depot, tank turnover time, filtration condition, water control, and emergency fueling options. Review routes that spend nights in colder areas than the home terminal. A fuel that is available at the main yard may not be available at a remote stop, and a cold-weather interruption can cost more than a modest per-gallon saving.
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DOE’s Federal Energy Management Program says most diesel refueling systems can handle biodiesel blends, and B20 or lower minimizes many materials-compatibility issues. AFDC guidance says B6–B20 installation is generally similar to conventional diesel installation, but operators should estimate on-site storage, verify existing tanks and equipment, and check local permitting conditions.
Review the entire fueling system
- Storage tanks, coatings, seals, gaskets, hoses, piping, pumps, filters, meters, and dispensers.
- Tank age, previous contents, sediment, water accumulation, and cleaning access.
- Materials compatibility documented by the equipment manufacturer.
- Fire, environmental, building, and weights-and-measures requirements in the jurisdictions where tanks are installed.
- Separate labeling and procedures if more than one blend is stored on site.
A tank that has held petroleum diesel for years can have deposits loosened during a fuel change, potentially loading filters or exposing contamination. Cleaning the tank and lines before conversion may be appropriate. The need and method should be determined by a qualified tank or fueling-system professional, not assumed from the fuel label.
When a separate tank may be unnecessary
If a fleet already has multiple diesel tanks, converting one system to B20 can cost less than adding a new tank. That approach still requires a compatibility review, cleaning plan, labeling, inventory controls, and a way to prevent the wrong blend from reaching a vehicle that is not approved for it.
Why blends above B20 need extra scrutiny
AFDC describes additional requirements and less widely compatible equipment for blends above B20. Moving to B30, B50, or B100 is therefore not a simple extension of a B20 program. Recheck equipment materials, storage, winter handling, permits, supplier capability, and every affected OEM warranty before considering a higher blend.
Operational trade-offs by blend
| Decision factor | B5 | B20 | B100 |
|---|---|---|---|
| Blend definition | Up to 5% biodiesel | 6%–20% biodiesel | Neat biodiesel |
| Fuel standard cited by DOE guidance | ASTM D975 can cover up to B5 as diesel fuel | ASTM D7467 | Used mainly as blendstock in the fleet context described |
| Vehicle approval | Low-level B5 blends are approved for diesel engines designed for petroleum diesel; verify the documentation | Many OEMs approve it, but not all; check the exact engine and warranty | Do not infer approval from B5 or B20 documentation |
| Energy and performance guidance | Lower biodiesel content means a smaller energy-content difference than higher blends | About 1%–2% less energy per gallon than petroleum diesel; many users report no noticeable performance or economy change | Not represented by the B20 performance guidance |
| Infrastructure considerations | Often handled within conventional diesel systems | Usually compatible after equipment review; cleaning may be needed | Additional equipment and handling considerations apply |
A practical fleet decision process
1. Segment the fleet
Create a list by engine family, model year, depot, route, annual miles, average payload, and seasonal exposure. Do not combine vehicles simply because they carry the same company logo or fuel at the same yard.
2. Establish the diesel baseline
Use a representative period of purchase invoices, gallons, miles, maintenance events, and delivery reliability. Record taxes, freight, and fees so the baseline is comparable with a biodiesel quote.
3. Obtain written blend approval
Match each vehicle segment to OEM documentation. Flag vehicles that can use B5 but lack B20 approval, and isolate them operationally if the fleet adopts more than one blend.
4. Request comparable supplier bids
Ask for delivered prices for the same dates, volume, location, and specification. Include minimum volumes, lead times, quality records, seasonal terms, and emergency supply.
5. Audit the fueling system
Have a qualified professional review tanks, lines, dispensers, seals, filters, permits, and cleaning needs. Decide whether one existing system can be converted or whether additional capacity is required.
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6. Run a controlled transition
Start with an approved vehicle group and a clearly identified tank. Track fuel, miles, weather, payload, filters, downtime, and supplier performance. Keep the diesel fallback available while the data set is being built.
7. Recalculate the business case
Compare delivered cost per mile, not only dollars per gallon. Include measured consumption, maintenance, preparation work, supply interruptions, and any financing or depreciation associated with equipment changes.
8. Set review triggers
Define the price spread, service level, cold-weather threshold, and warranty or quality event that would cause the fleet to pause, expand, or reverse the program.
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Assuming every diesel truck can use B20
Why it fails: B20 approval is manufacturer- and engine-specific.
Fix: Build an approval matrix from written OEM documentation before signing a fuel contract.
Budgeting from a national average
Why it fails: The April 2025 DOE average does not include your freight, volume, region, taxes, or contract terms.
Fix: Compare current delivered quotes for the exact depots and volume you operate.
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Ignoring the tank’s history
Why it fails: Deposits, sediment, or water can create filter and fuel-quality problems during a changeover.
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Fix: Inspect and clean the system when appropriate, document the work, and plan early filter checks.
Treating B100 as “more B20”
Why it fails: Higher blends bring different equipment, storage, cold-weather, and approval questions.
Fix: Requalify the entire vehicle and fueling system for the proposed blend.
Measuring only fuel price
Why it fails: A cheap gallon can be expensive per mile if supply is unreliable or preparation costs are omitted.
Fix: Track cost per mile, uptime, maintenance, and delivery performance together.
What one fleet’s experience shows—and does not prove
The DOE State & Alternative Fuel Provider Fleets case study reports that Florida Power & Light began using biodiesel in fleet vehicles in 1999. During its Model Year 2023 program reporting period, the utility procured B100 and petroleum diesel in bulk to blend its own B20 and used more than 2.5 million gallons of B20.
The case study quotes the FPL team: “For fleets that have B20 available, it’s easy because you use the same fixed fuel facilities, you use the same transport equipment, you can put B20 in a vehicle one day and put ultra-low sulfur diesel in the next day and it will not affect the operation of the vehicle at all.” That is FPL’s account of its fleet, facilities, and supply—not a guarantee for every truck operation.
In the same case study, FPL fleet fuel manager Patti Earley says, “Biodiesel actually puts that lubrication back in the fuel that was taken out when the sulfur content of diesel fuel went down.” Treat that as her stated rationale, not proof that every fleet will experience lower maintenance costs.
Questions to put in the procurement contract
- Which finished-fuel standard applies, and what documentation accompanies each load?
- What blend percentage is guaranteed at delivery, and how are off-specification loads handled?
- What minimum annual or monthly volume is required?
- How are freight, taxes, storage, and emergency deliveries priced?
- What seasonal blend and cold-weather support will be available at each depot?
- Who is responsible for contamination, cleanup, filter loading, or vehicle downtime linked to fuel quality?
- Can the supplier support a temporary switch to petroleum diesel if biodiesel is unavailable?
Bottom-line decision rule
Choose B5 when the fleet wants a low-level blend that fits conventional diesel specifications and the OEM documentation supports it. Consider B20 when the exact engines are approved, a reliable local supply meets ASTM D7467, the fueling system passes a compatibility review, and delivered cost per mile is competitive after all transition and seasonal costs. Stay with petroleum diesel—or limit biodiesel to approved vehicle groups—when warranty coverage, supply continuity, cold-weather service, or infrastructure readiness is unresolved.
No universal total-cost winner applies to every fleet. The sound decision combines current delivered bids, measured fuel consumption, written engine approval, supply reliability, storage compatibility, and route-specific operating requirements.
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