Diesel vs Gas Truck Cost of Ownership: 5-Year Super Duty Comparison (2026)

Should You Buy a Diesel or Gas Super Duty?

Buy the 6.7L Power Stroke diesel if you regularly tow more than 10,000 lbs, drive over 15,000 miles a year, or plan to keep the truck 10 years or longer. Buy the 7.3L gas engine if you tow lightly, drive under 12,000 miles a year, or plan to sell within five years. The diesel F-250 costs $8,000-$12,000 more up front, saves $155-$386 a year in fuel, costs $400-$500 more a year to maintain, and tows 32,500 lbs versus 14,000 lbs for the gas truck.

Those four numbers decide most purchases. At LR Wheels N Lifts in Tampa we service both engines daily, and the sections below lay out the power, fuel, maintenance, towing, resale, emissions and five-year cost data behind that recommendation so you can run it against your own driving.

How Do the 6.7L Diesel and 7.3L Gas Compare on Power?

The 6.7L Power Stroke diesel makes 475 hp and 1,050 lb-ft of torque at 1,600 RPM. The 7.3L Godzilla gas V8 makes 430 hp and 475 lb-ft at 4,000 RPM. The diesel has more than double the torque, delivered at idle-adjacent engine speeds, which is why it tows 32,500 lbs to the gas truck's 14,000 lbs on the same F-250 chassis.

2024-2025 Ford F-250 Engine Specifications

Diesel Engine Advantages

The diesel engine's massive torque advantage is immediately apparent in the specifications above. With over 1,050 lb-ft of torque available at just 1,600 RPM, diesel engines pull hard from a standstill and maintain excellent pulling power throughout the rpm range.

• Superior Low-End Torque: Diesel engines deliver peak torque at significantly lower RPMs, providing immediate pulling power ideal for loaded trucks
• Engine Longevity: Diesel engines typically last 300,000+ miles with proper maintenance, compared to 200,000-250,000 for gasoline engines
• Towing Performance: The torque advantage translates to dramatically higher towing capacities (32,500 lbs vs. 14,000 lbs for F-250)
• Grade Holding: Better ability to maintain speed while towing on hills and grades without excessive downshifting
• Load Stability: Superior performance when fully loaded or towing heavy trailers

Gasoline Engine Advantages

While the gasoline engine can't match diesel torque, it has its own performance profile that appeals to certain users.

• RPM Power Band: Higher horsepower output (430 vs 475), particularly useful for occasional towing and acceleration
• Responsiveness: Quicker throttle response and more linear power delivery feel more familiar to most drivers
• Simpler Operation: No DEF fluid, glow plugs, or aftertreatment complexity -- just traditional fuel and oil
• Lower Initial Cost: Gasoline F-250 trucks cost $8,000-$12,000 less than diesel equivalents
• Lighter Weight: Slightly lighter engine reduces overall vehicle weight by approximately 200 pounds

Which Super Duty Engine Gets Better Fuel Economy?

The 6.7L diesel F-250 is rated at 17 MPG combined (15 city / 20 highway) against 14 MPG combined (12 / 16) for the 7.3L gas engine. Diesel fuel costs more per gallon, so the real saving is $155 a year at 8,000 miles, $232 at 12,000 miles and $386 at 20,000 miles, before DEF costs. The tables below show the math.

EPA Fuel Economy Ratings

Annual Fuel Cost Comparison (Real-World Scenarios)

Based on current fuel prices and real-world driving patterns, here's how the engines compare across different annual mileage scenarios:

DEF (Diesel Exhaust Fluid) Costs

Diesel trucks require Diesel Exhaust Fluid (DEF) to meet emissions standards. DEF is consumed proportionally to fuel -- modern diesel trucks use approximately 2-3% DEF by volume of fuel consumed.

• Cost: Approximately $0.90-$1.25 per gallon at gas stations, less at bulk suppliers
• Annual Usage (12k miles): Approximately 17-25 gallons based on 12-15 gal/thousand miles consumption
• Annual DEF Cost: Approximately $150-$315 per year
• Warning System: Modern trucks warn when DEF level is low and won't start without adequate DEF (safety feature to ensure emissions compliance)
• DEF Monitoring: Quality diesel owners keep DEF topped up as part of regular maintenance

Long-Term Fuel Cost Analysis (5-Year Ownership)

Is a Diesel Super Duty More Expensive to Maintain?

Yes. Scheduled maintenance on a diesel Super Duty runs $1,200-$1,600 a year against $800-$1,100 for the gas engine, roughly 50-75% more. Fuel filters, glow plugs and DEF/EGR service have no gas equivalent. In return, the 6.7L diesel typically lasts 300,000+ miles versus 200,000-250,000 for the 7.3L gas, which can even out the per-mile cost for long-term owners.

Maintenance Cost Comparison (10,000 Mile Service Intervals)

Annual Maintenance Cost Estimates

Reliability: Which Engine Lasts Longer?

Diesel Engine Lifespan: With proper maintenance, diesel Power Stroke engines commonly reach 300,000 to 400,000+ miles. Many commercial fleet operators report trucks with 500,000+ miles running strong. The robust design and lower RPM operation contribute to exceptional longevity.

Gasoline Engine Lifespan: The 7.3L Godzilla gasoline engine is newer (introduced 2020) with limited long-term data. Historical Ford gasoline truck engines typically last 200,000-250,000 miles. However, design improvements may extend this lifespan.

The diesel's longevity advantage is substantial. A diesel truck that runs 300,000 miles means 150,000 additional miles compared to a gasoline truck, translating to potentially another 7-10 years of useful service life.

Emissions Systems & Complexity

Modern diesel trucks include sophisticated emissions aftertreatment systems (DEF injection, SCR catalytic converters, EGR systems) that add complexity and potential failure points. Repairs to these systems can exceed $3,000-$5,000 in some cases.

Gasoline trucks have simpler emissions systems. Modern catalytic converters are straightforward, and repair costs are generally lower when issues arise.

How Much More Can a Diesel Super Duty Tow?

A diesel F-250 tows up to 32,500 lbs and carries a 4,200 lb payload; the gas F-250 tows 14,000 lbs with a 3,300 lb payload. Both handle boats and utility trailers under 8,000 lbs comfortably. The gas engine becomes marginal at 8,000-10,000 lbs and is not recommended for gooseneck or equipment trailers above 12,000 lbs.

Towing Capacity by Purpose

Payload Capacity Comparison

Beyond towing, payload capacity (what you can carry in the bed) matters significantly for work trucks:

• Diesel F-250: 4,200-4,600 lbs payload capacity (varies by configuration)
• Gasoline F-250: 3,300-3,700 lbs payload capacity
• Difference: Diesel provides approximately 500-900 additional lbs of payload capacity

For contractors carrying equipment, materials, or tools, this additional capacity matters daily. A diesel truck can handle heavier tool boxes, material loads, and equipment that would exceed gasoline capacity.

Grade Holding & Performance with Load

The diesel's low-end torque advantage becomes critically important when loaded. Real-world testing shows:

• Diesel with full load: Maintains 45-50 mph on 6% grades without excessive downshifting
• Gasoline with same load: May drop to 30-35 mph on 6% grades, requiring frequent downshifting
• Fuel economy under load: Diesel typically maintains reasonable efficiency under load; gasoline MPG drops significantly
• Transmission strain: Gasoline engines force more transmission downshifting when loaded, increasing wear

Does a Diesel Super Duty Hold Its Value Better?

Yes, by a widening margin. Based on 2024 market data, a diesel F-250 retains about 68% of MSRP after three years and 58% after five, versus 62% and 50% for the gas truck. At ten years the gap is 35% against 25%. Buyer demand for towing capability and the diesel's longer service life drive the difference.

Depreciation Comparison (Based on 2024 Market Data)

Real-World Valuation Example

Scenario: 2024 Ford F-250 SuperCrew Diesel vs. Gasoline purchased at $75,000 MSRP, 60,000 miles after 5 years.

Why Diesel Holds Value Better

Several factors contribute to diesel trucks holding value better:

• Durability Reputation: Buyers know diesel trucks typically last significantly longer
• Towing Appeal: Heavy truck users actively seek diesel trucks for towing capability
• Limited Supply: Fewer high-mileage gasoline trucks available creates stronger demand for diesel options
• Commercial Demand: Fleet buyers and commercial operators strongly prefer diesel
• Long-Term Utility: Diesel trucks maintain utility longer, appealing to buyers seeking durability

Which Engine Produces Fewer Emissions?

The diesel F-250 emits about 510 grams of CO2 per mile against roughly 620 for the gas truck, a 15-20% advantage worth around 2.8 metric tons over 60,000 miles. The trade-off is nitrogen oxides and particulate matter, which modern DEF and SCR aftertreatment reduce substantially but not to zero. Neither full-size truck is a low-impact vehicle.

Emissions Comparison

CO2 (Greenhouse Gas) Emissions

Diesel engines produce approximately 15-20% fewer CO2 emissions than comparable gasoline engines due to superior fuel efficiency. Per mile driven, a diesel truck produces less CO2.

• Diesel (F-250): Approximately 510 grams CO2/mile (combined 17 MPG)
• Gasoline (F-250): Approximately 620 grams CO2/mile (combined 14 MPG)
• 5-Year Advantage: Diesel produces roughly 2.8 metric tons LESS CO2 than gasoline over 60,000 miles

Particulate Matter & NOx Emissions

This is where diesel's environmental profile becomes complicated. While modern diesel trucks (2010+) with SCR aftertreatment systems meet strict EPA standards, diesel engines traditionally produce more particulate matter and nitrogen oxides than gasoline engines. Modern diesel trucks with DEF and catalytic converters reduce these significantly, but not to zero.

• Particulate Matter (PM): Modern diesel trucks produce 90%+ less PM than 2000s-era diesels due to emissions controls
• NOx Emissions: Diesel engines still produce more NOx than gasoline, though modern controls reduce the problem substantially
• EPA Compliance: All 2020+ diesel trucks meet Tier 3 EPA emissions standards

DEF and Sustainability

DEF is a synthetic compound made from urea and deionized water. It's non-toxic and readily available, but represents an additional resource consumption that gasoline trucks don't require.

Overall Environmental Assessment

When Should You Choose Diesel vs Gas?

Choose the diesel Super Duty when you tow 10,000 lbs or more regularly, drive 15,000+ miles a year, haul heavy payloads, or plan to keep the truck past ten years. Choose the gas Super Duty when towing is occasional and under 10,000 lbs, annual mileage is modest, or you want the lower purchase price and simpler upkeep. The lists below match each engine to specific owners.

Choose DIESEL If You:

Choose GASOLINE If You:

Specific Use Case Examples

Contractor with Small Fleet: DIESEL. You'll benefit from longer engine life, superior towing for equipment trailers, and higher resale value on fleet vehicles. The daily usage justifies diesel's higher cost.

Weekend Recreational User: GASOLINE. Your low mileage and light towing don't justify diesel's higher purchase price. The fuel economy savings won't accumulate enough to offset the initial premium.

Moderate Use (Business & Personal): DIESEL. If you use the truck 15,000+ miles annually and occasionally tow 10,000+ lbs, diesel's advantages accumulate. The engine durability and resale value become worthwhile.

Heavy-Duty Commercial Operation: DIESEL. No question. Superior towing, payload capacity, grade-holding ability, and 300,000+ mile lifespan make diesel the only practical choice.

What Does Each Engine Cost Over 5 Years?

For an F-250 SuperCrew driven 12,000 miles a year, the gas engine comes out roughly 10% cheaper over five years once purchase price, fuel, maintenance and resale are combined. The breakeven for diesel arrives around 15,000+ annual miles with regular towing, or past ten years of ownership. The worked example below shows each line item.

Scenario: F-250 SuperCrew with 12,000 Annual Miles

5-Year Cost Comparison Summary

• Diesel advantage: Lower fuel consumption and higher resale value retention
• Gasoline advantage: Lower purchase price, lower maintenance, lower insurance costs
• Total 5-Year Difference: Gasoline saves approximately $13,940 total ($0.23/mile)

How to Decide: Four Questions

Four questions settle the diesel-versus-gas decision for a Ford Super Duty: how many miles you drive each year, how much you tow, how long you will keep the truck, and what you can spend up front. Answer them honestly and one engine usually wins outright; the framework below gives the thresholds for each.

Decision Framework

Use this framework to determine which engine suits your situation:

1. Calculate Your Expected Annual Mileage

• Under 8,000 miles/year -- Gasoline likely better (fuel savings too modest)
• 8,000-15,000 miles/year -- Depends on towing needs
• Over 15,000 miles/year -- Diesel increasingly advantageous

2. Assess Your Towing & Payload Needs

• Rarely tow or carry heavy loads -- Gasoline sufficient
• Regular towing 8,000-15,000 lbs -- Diesel preferred
• Frequent towing 15,000+ lbs -- Diesel essential

3. Determine Ownership Timeline

• Keep truck 3-5 years -- Gasoline better (lower initial cost)
• Keep truck 5-10 years -- Potentially break even on diesel cost
• Keep truck 10+ years -- Diesel likely better (longevity advantage)

4. Consider Your Financial Situation

• Limited budget for initial purchase -- Gasoline is more accessible
• Can afford higher upfront cost -- Diesel provides long-term value
• Plan business use/tax deduction -- Evaluate total operational cost

Quick Decision Guide

Choose DIESEL if: You tow regularly (10,000+ lbs), drive 15,000+ miles annually, plan to keep the truck 7+ years, or use it commercially.

Choose GASOLINE if: Budget is the primary consideration, you tow light loads only, drive fewer than 12,000 miles annually, or plan to keep the truck only 5 years.

Key Takeaways

• Diesel provides superior torque, towing capacity, and longevity (300,000+ miles possible)
• Gasoline costs $8,000-$12,000 less upfront with lower maintenance expenses
• Fuel economy favors diesel by 20-25%, but this saves only $150-$400 annually
• Over 5 years of moderate use, gasoline is typically 10% cheaper overall
• Over 10+ years of heavy use, diesel becomes more economical due to durability
• Diesel holds resale value better (8-10% advantage at 5-10 year mark)
• Environmental impact slightly favors diesel (lower CO2), but neither is "clean"
• Maintenance costs run 50-75% higher annually for diesel trucks
• The breakeven point for diesel premium is approximately 150,000-200,000 miles with regular towing

Making Your Final Decision

At LR Wheels N Lifts, we help customers evaluate this decision regularly. The best approach is honest assessment of your actual needs, not imagined scenarios. Many buyers choose diesel hoping they'll tow more than they actually do, or gasoline assuming fuel economy will be better than it is.

Already own a Super Duty? We build them too - lift kits, wheels, tires, and heavy duty alignment, all done in-house. And if you're still evaluating F-250 or F-350 trucks, our team can help you test-drive both options, discuss your specific use case, and understand the real-world implications of each choice. We're located at 6923 W Hillsborough Ave in Tampa, Florida, and available at (813) 464-9023.