If you’re looking for heavy-duty trucks, you probably want power, durability, and smart fuel use. The 2025 Chevrolet Silverado 2500 brings that in two flavors: gasoline and diesel. We get a lot of questions at Monument Chevrolet about which one to pick. The answer depends on how you drive, how much you tow, and what you expect at the pump.
In this article, our team at Monument Chevrolet in Pasadena, Texas, will compare the fuel economy of the 2025 Silverado 2500 gas and diesel engines. We’ll also discuss performance, costs, and how these trucks behave in real-world conditions.
Engine Specifications and Performance Insights
The engine is the first factor to consider when comparing the gas-powered vs. diesel Silverado 2500. Both versions of the 2025 Chevrolet Silverado 2500 are built for hard work, but they serve different needs.
Here’s a closer look at the 2025 Chevrolet Silverado 2500 HD specs when equipped with the standard 6.6L V-8 gas engine:
- 401 horsepower
- 464 lb-ft of torque
- 10-speed Allison automatic transmission
- Towing capacity of up to 19,080 pounds
And here are the specs of the 2025 Silverado 2500 HD when equipped with the available 6.6L Duramax Turbo-Diesel V-8:
- 470 horsepower
- 975 lb-ft of torque
- 10-speed Allison automatic transmission
- Towing capacity of up to 22,500 pounds
The diesel engine specs show a big bump in torque, making it ideal for heavy towing. It also pulls ahead in acceleration, going from 0 to 60 mph in around 6.4 seconds.
Both options come with rear-wheel drive as standard, and you can choose four-wheel drive on most trims.
Fuel Economy Analysis: Gas vs. Diesel
Fuel economy is a hot topic, but here’s the catch: the EPA doesn’t rate heavy-duty trucks such as the 2025 Chevrolet Silverado 2500. That means we rely on real-world numbers to compare the Silverado 2500 gas vs. diesel miles per gallon.
Gas Engine: Fuel Economy Ratings and Real-World Performance
Let’s talk gas mileage for 2500 Silverado models. While there’s no official EPA rating, drivers typically see about 16 to 17 mpg in mixed driving. This makes the gas version decent for everyday hauling, light towing, and general use.
The gas engine is simple to maintain and has lower up-front costs. If you rarely go on long trips or tow heavy loads, this might be all you need.
Diesel Engine: Fuel Economy Ratings and Real-World Performance
In a controlled 100-mile loop, the 2025 Silverado 2500 HD Trail Boss with the Duramax engine hit 20.4 mpg. On a highway run at 75 mph, Car and Driver logged 18 mpg in a similar diesel model.
Here’s where the Chevrolet Silverado gas or diesel choice gets interesting. Diesel engines hold their efficiency better when towing or carrying heavy loads. That means lower fuel costs over time if you’re putting the truck to work.
While diesel fuel can be more expensive, the improved mileage offsets the fuel cost, especially over long distances.
Factors Affecting Fuel Efficiency in Heavy-Duty Trucks
Fuel efficiency in trucks such as the 2025 Chevrolet Silverado 2500 depends on more than just the engine. Several design and usage factors determine how far each gallon of fuel can take you.
Here are real-life factors that impact the Silverado 2500 gas vs. diesel fuel economy:
Aerodynamics: Heavy-duty trucks are boxy, but the Silverado 2500 has been designed to reduce drag where possible, helping it move more efficiently at highway speeds.
Vehicle weight: Chevrolet uses lighter materials where possible, reducing weight without compromising strength. Less weight means better fuel use.
Engine tech: Both the gas and diesel engines use the same Allison 10-speed automatic transmission, which helps deliver smooth power and supports better mileage.
Tire pressure: The built-in tire pressure monitoring system alerts you when tires are low on air, helping reduce rolling resistance and fuel waste.
Driving habits: Features such as cruise control help steady your speed, avoiding constant starts and stops that eat up fuel.
Load and towing: Diesel engines are more efficient under heavy loads, maintaining better mileage when towing than gas models.
Maintenance: Regular oil changes, air filter replacements, and tuneups keep the engine running efficiently. Both options need care, but diesel engines tend to last longer with proper maintenance.
So, how you drive and maintain your Silverado 2500 affects its real-world fuel economy, regardless of the engine you choose.
Cost Considerations: Upfront and Long-Term Ownership
Looking at the 2025 Silverado 2500 HD price points helps frame the gas vs. diesel debate. The base model’s starting MSRP is $51,600, with high-end trims climbing to $72,900. Diesel versions usually cost more upfront, but there’s more you should consider when thinking about ongoing costs.
Here’s what you should think about over time:
Fuel costs: Diesel fuel may cost more per gallon, but better mileage, especially under load, can make up for the difference. If you’re towing often, a diesel engine could save you money at the pump.
Maintenance: Gas trucks typically have lower routine service costs. Diesel engines, while durable, can incur higher maintenance bills over the long term.
Depreciation: All heavy-duty trucks lose value over time, with the largest drop occurring within the first few years. Diesel models often hold value better, especially for resale in work-related markets.
Financing: Rates, loan terms, and credit matter here. You can compare options and even apply for financing through our online tools to see what works for your budget.
Long term, the decision between a gas or diesel Chevrolet Silverado comes down to usage. Diesel costs more initially but may last longer and save on fuel if you frequently drive long distances or tow heavy loads.
Which Truck Is Right for You?
Here’s how we see it at Monument Chevrolet. The diesel truck option offers better fuel economy and long-term durability if you’re towing heavy loads, hauling gear daily, or driving long distances. It shines in heavy-duty roles.
However, if you’re looking for a reliable truck for general use, occasional towing, and local driving, the gas engine is more cost-effective upfront and easier to maintain.
Want to see what’s available now? Take a look at our inventory of new Chevy vehicles. Our team is ready to help you find the Silverado 2500 that fits your work and your budget.
Image courtesy of Chevrolet
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