For a used pickup, neither gasoline nor diesel is automatically cheaper to own. Diesel can make financial sense when high mileage and sustained heavy towing or hauling let its fuel-economy and work-capability advantages offset a higher purchase price and repair exposure. For lighter use and ordinary driving, gasoline often costs less. The answer for a specific truck depends on its price, condition, workload, local fuel costs and expected resale value.
What determines which used truck costs less?
Compare two specific trucks over the same ownership period and mileage—not fuel economy ratings or engine types in isolation. Include the truck’s ability to do the work you need: a lower-cost option that cannot safely meet your towing or payload requirement is not a valid comparison.
There is no established, condition-adjusted average ownership-cost difference for used gasoline and diesel pickups. The U.S. Department of Energy-hosted 2021 total-cost study covers modeled light-duty vehicles and commercial Class 4–8 trucks, but it does not provide a direct used-pickup comparison. Its heavy-truck figures should not be treated as pickup cost estimates.
Fuel economy is not the same as fuel savings
Diesel fuel has about 15% greater energy density than gasoline, according to the U.S. Environmental Protection Agency’s 2025 Automotive Trends Report. That helps explain why diesel vehicles often achieve higher fuel economy; it does not mean a diesel pickup gets exactly 15% better MPG or costs less to fuel.
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Your fuel bill depends on the truck’s real-world MPG and the price per gallon. The U.S. Energy Information Administration’s weekly U.S. average for the week of September 28, 2026 was $6.382 per gallon for diesel and $4.157 for regular gasoline. Those national figures are a dated snapshot, not a local quote or forecast; check prices where you drive.
Estimate fuel cost using annual miles divided by realistic MPG, multiplied by local price per gallon. Use MPG that reflects your actual mix of unloaded driving, towing, hauling, idling and routes. A rating or an MPG figure from someone else’s truck may not represent your use.
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When diesel may be worth the added cost
Diesel is more likely to compete financially when you drive many miles and regularly tow or haul heavy loads. Its fuel-economy and work-capability advantages may matter more under sustained work than they do in light-duty use. Cars.com offers high mileage, heavy daily hauling and use beyond 200,000 miles as broad rules of thumb for when diesel may cost less; these are not guarantees for a particular truck.
Set those potential savings against the exact diesel’s purchase price, financing, maintenance history and repair risk. A fuel advantage cannot compensate automatically for a large purchase premium or an expensive repair. Compare trucks with similar capability and condition, and use the MPG you expect while doing the work.
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When gasoline may be the lower-cost choice
For ordinary driving, modest annual mileage or light trailer use, a gasoline pickup often has the cost advantage. If the diesel’s fuel savings are small in your driving pattern, they may not offset what you pay to buy it or the risk of repairs on an older, used truck.
That is a use-case rule, not a blanket claim that gasoline trucks are always cheaper to maintain. Engine, model year, condition, service history, local labor and parts costs, and the particular truck’s workload all affect ownership costs.
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Compare the full ownership cost
AAA groups ownership costs into six broad categories, while the DOE’s Alternative Fuels Data Center calculator supports custom inputs for gasoline and diesel MPG. These tools help organize a comparison; they cannot supply a definitive verdict for every used pickup. DOE cautions that prices and specifications change and that some calculator data are unverified. AAA’s method also notes that maintenance intervals vary by make and model, so follow the specific owner’s manual.
For each truck, calculate the same planned ownership years and miles:
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- Purchase and financing: Use the out-the-door price, including applicable taxes and fees, and account for financing costs. Do not compare one truck’s asking price with the other’s total financed cost.
- Fuel: Calculate (annual miles ÷ realistic MPG) × current local price per gallon. Adjust MPG for towing, payload, route, speed and idling.
- Insurance and registration: Get estimates for the specific trucks and your location rather than assuming the figures are alike.
- Maintenance, tires and repairs: Include scheduled service, tires and a repair reserve informed by the truck’s mileage, records, condition and inspection. Avoid assuming that a generic average fits an older vehicle.
- Resale: Subtract a conservative expected sale value at the end of your ownership period. Check comparable local trucks rather than counting on a guaranteed diesel premium.
Then compare the totals. If your annual mileage, future fuel price or repair exposure is uncertain, run low, base and high cases for those assumptions. This makes it easier to see whether a small change reverses the result.
Quick Recap
How to make the comparison fair
- Match capability: Compare trucks that can both handle your actual trailer, payload and work requirements.
- Match ownership assumptions: Use the same years and miles for each truck, including the same share of towing or hauling and similar load weights.
- Use truck-specific information: Record model year, engine, trim, drivetrain, mileage, condition and purchase price. General powertrain averages can be overwhelmed by differences between individual used trucks.
- Check local costs: Use local fuel prices and estimates for insurance, taxes, fees, parts and labor.
- Verify condition: Review service records and get a qualified pre-purchase inspection for the exact truck. A truck’s prior workload and maintenance can change its likely costs substantially.
- Be conservative about resale: Cars.com notes that diesel pickups have historically retained higher values, but that broad observation does not establish a premium for a particular model, year, mileage or condition. Check comparable local listings and avoid treating resale value as certain.
Sources and what they establish
- U.S. Department of Energy Alternative Fuels Data Center vehicle cost calculator: a framework for comparing custom inputs, not a guaranteed used-pickup verdict.
- AAA Your Driving Costs Calculator and Ownership Cost Methodology: ownership-cost categories and used-vehicle cost methodology; maintenance schedules depend on the vehicle.
- U.S. Environmental Protection Agency, 2025 Automotive Trends Report: fuel energy-density context, not a direct used-pickup cost comparison.
- U.S. Energy Information Administration weekly gasoline and diesel prices: national weekly averages that can differ from local prices.
- Cars.com’s diesel-versus-gasoline pickup guidance: broad use-case and resale observations, not a controlled cost study of used trucks.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
