Breaking Down Power, Torque, Reliability, and Real-World Use for RAM Truck Buyers
If you’re shopping for a RAM truck—whether it’s a 2500, 3500, or even a 1500—you’ve likely asked the big question: Is a HEMI better than a Cummins? This debate isn’t just about gasoline vs. diesel. It’s about power delivery, long-term ownership, towing, maintenance costs, and what you really need your truck to do.
In this guide, we’ll explore how HEMI gas engines and Cummins diesel engines compare in real-world categories like towing, fuel economy, reliability, cost of ownership, and which engine makes sense for different types of drivers.
What Are HEMI and Cummins?
Before comparing, let’s break down what each engine type is:
HEMI
A HEMI is a gas-powered V8 engine known for its hemispherical combustion chamber. RAM currently uses two primary HEMI options:
- 5.7L HEMI V8 (RAM 1500 and some 2500s)
- 6.4L HEMI V8 (standard on RAM 2500 Power Wagon and some 3500s)
HEMIs are naturally aspirated, high-revving, and known for their smooth acceleration and deep exhaust note.
Cummins
The Cummins 6.7L Turbo Diesel I6 is a straight-six turbocharged diesel engine found in RAM 2500 and RAM 3500 trucks. Built for torque, longevity, and heavy-duty work, it’s a commercial-grade diesel that’s been a staple in RAM HD trucks since 1989.
Power & Torque Comparison
| Engine | Horsepower | Torque | Max Towing Capacity |
|---|---|---|---|
| 5.7L HEMI V8 | 395 hp | 410 lb-ft | ~11,610 lbs (RAM 1500) |
| 6.4L HEMI V8 | 410 hp | 429 lb-ft | ~17,540 lbs (RAM 2500) |
| 6.7L Cummins (standard) | 370 hp | 850 lb-ft | ~22,670 lbs (RAM 2500) |
| 6.7L Cummins HO (RAM 3500 only) | 420 hp | 1,075 lb-ft | ~37,090 lbs (gooseneck) |
Cummins wins on torque. That’s important for pulling trailers, boats, equipment, and climbing hills while towing at highway speeds.
HEMI wins on throttle response. These gas engines feel faster in unloaded daily driving, thanks to quicker revving and more responsive acceleration.
Towing and Payload: What Engine Pulls More?
If you’re towing a large fifth wheel, car hauler, horse trailer, or heavy machinery, the Cummins diesel is the clear winner. With over 1,000 lb-ft of torque in the HO version, it’s built for maximum low-end pulling power.
That said, the 6.4L HEMI can tow over 17,000 lbs when properly equipped—more than enough for most weekend warriors or moderate contractors.
Payload Comparison:
- HEMI RAM 2500 (gas): Often offers higher payload (~3,990 lbs)
- Cummins RAM 2500 (diesel): Lower due to heavier engine (~3,160 lbs)
If you haul heavy in-bed loads regularly, the HEMI may provide more legal payload capacity.
Fuel Economy: Diesel vs. Gas
This is where things get nuanced. While EPA doesn’t officially rate heavy-duty truck MPG, real-world averages tell the story:
| Engine | Empty MPG (Highway) | Towing MPG |
|---|---|---|
| 6.4L HEMI | 13–17 mpg | 7–10 mpg |
| 6.7L Cummins | 17–22 mpg | 10–14 mpg |
The Cummins engine is more efficient, especially under load. Diesel fuel typically costs more per gallon, but improved mileage and range (thanks to a 32+ gallon tank) make it a smarter choice for long hauls or commercial use.
Maintenance and Longevity
Cummins Diesel:
- Oil changes: Every 15,000 miles, but with higher oil capacity and cost (~$120+)
- Fuel filters: Must be changed regularly
- DEF system: Requires refills and can lead to costly repairs if neglected
- Turbo & emissions systems: Adds complexity and potential repair costs
- Expected lifespan: 300,000–500,000 miles with proper maintenance
HEMI Gas:
- Oil changes: Every 6,000–8,000 miles (~$60–$90)
- Fewer moving parts: Easier and cheaper to service
- No DEF, no turbo
- Expected lifespan: 200,000+ miles with good care
Cummins engines last longer, but HEMI trucks are cheaper and simpler to maintain for daily drivers and occasional towers.
Initial Cost and Resale Value
- The Cummins option adds $9,500+ to a RAM 2500 or 3500 build.
- In return, diesel models hold value better and sell quicker on the used market.
- HEMI-equipped trucks cost less upfront and still hold strong value due to demand and reliability.
If you plan to own the truck for 3–5 years and tow occasionally, the HEMI may be more cost-effective. For long-term owners, commercial users, or anyone towing frequently, Cummins’ higher resale value can offset its initial cost.
Daily Driving Experience
- HEMI trucks feel faster in town, rev quicker, and are quieter overall.
- Cummins trucks sound like a heavy-duty workhorse, which some love—but others find noisy.
- For highway cruising, the Cummins has lower RPMs, making for a relaxed drive with fewer downshifts.
If you don’t tow regularly or need maximum torque, most drivers will enjoy the HEMI experience more on a day-to-day basis.
So, Is a HEMI Better Than a Cummins?
The answer depends on what you need your RAM truck to do. Here’s a breakdown:
| Use Case | Best Engine |
|---|---|
| Light towing + daily driving | 6.4L HEMI |
| Hauling max loads regularly | Cummins |
| Long-distance towing | Cummins |
| Lower maintenance costs | HEMI |
| Higher resale after 5–7 years | Cummins |
| Lower purchase price | HEMI |
| Extreme longevity (300K+ miles) | Cummins |
| In-bed payload hauling | HEMI |
Final Verdict from Simi Valley Chrysler Dodge Jeep Ram
At Simi Valley CDJR, we help drivers choose the right engine for their lifestyle. If you’re a contractor pulling a skid steer every day, or an RVer with a 35-foot fifth wheel, the Cummins diesel is worth every penny. But if you’re looking for reliable V8 power at a better price point with lower maintenance, the HEMI is your go-to.
Both engines are excellent—but they serve different needs.
Still debating HEMI vs. Cummins?
Stop by Simi Valley Chrysler Dodge Jeep Ram or give us a call to test drive both back-to-back. Our truck experts will walk you through every option—from RAM 2500 Tradesman to Limited and Power Wagon trims.
Find your perfect truck at Simi Valley CDJR—where capability meets confidence.
Connect with us
