If you're checking out the 2024 ram 2500 6.4 mpg figures, you're likely trying to figure out if your wallet can handle the frequent gas station visits that come with owning a heavy-duty rig. Let's be honest right out of the gate: nobody buys a three-quarter-ton truck with a massive V8 because they want to save the planet or win a fuel economy contest. You buy this truck because you've got stuff to move, trailers to pull, and work to get done. Still, knowing what to expect at the pump is a huge part of the buying process, and there's a lot of "it depends" when it comes to the real-world numbers of the 6.4L Hemi.
The Reality of the 6.4L Hemi Engine
The heart of this beast is the 6.4-liter HEMI V8. It's a legendary engine for a reason—it's simple, powerful, and sounds pretty great when you step on it. In the 2024 model, this engine is pumping out 410 horsepower and 429 lb-ft of torque. That's plenty of grunt for most people, but all that power requires a lot of fuel to keep the cylinders firing.
One thing you should know is that the EPA doesn't actually provide official fuel economy ratings for heavy-duty trucks like the Ram 2500. Since these vehicles have a Gross Vehicle Weight Rating (GVWR) of over 8,500 pounds, they're exempt from the standard window sticker mpg ratings you see on a sedan or even a half-ton Ram 1500. This leaves us relying on real-world testing, owner reports, and long-term averages to get the true picture of the 2024 ram 2500 6.4 mpg performance.
Ram has paired this engine with the ZF 8-speed automatic transmission (the 8HP75), which is honestly one of the best things to happen to this truck. It shifts smoothly and does its best to keep the engine in the "sweet spot" for efficiency, but it can only do so much against the laws of physics and aerodynamics.
What the Numbers Look Like in the Real World
So, what are people actually seeing? If you're driving an empty truck on a flat highway at a reasonable speed—let's say 65 to 70 mph—you might see somewhere between 14 and 16 mpg. If you have a light foot and the wind is at your back, you might even tickle 17 mpg for a brief, glorious moment.
However, start doing "truck things" or driving like you're in a hurry, and those numbers drop fast. In typical city driving, with stop-and-go traffic and idling at lights, you should expect to see somewhere in the 8 to 11 mpg range. It's a heavy truck, and getting that much mass moving from a dead stop over and over again is where the Hemi gets thirsty.
On a combined cycle—a mix of some highway cruising and some city errands—most owners report an average of around 12 to 13 mpg. If you're coming from a mid-size SUV or a half-ton truck with a small V6 or a diesel, these numbers might look scary. But for a gas-powered HD truck, they're actually right in line with the competition from Ford and Chevy.
Towing and Hauling: The True Test of Fuel
Towing is the reason the Ram 2500 exists. Whether it's a horse trailer, a flatbed full of equipment, or a big camping trailer, this truck is a workhorse. But when you hook up a 10,000-pound load, the 2024 ram 2500 6.4 mpg will inevitably take a nosedive.
When towing heavy loads, most drivers report getting between 7 and 10 mpg. The shape of what you're towing matters just as much as the weight. A tall, boxy travel trailer creates a massive amount of wind resistance, which will drag your fuel economy down more than a heavy but low-profile flatbed trailer.
The 6.4L Hemi does feature Multi-Displacement System (MDS) technology, which shuts down four of the eight cylinders when the truck is cruising under light load to save fuel. It's a cool feature, and you'll see a "Fuel Saver" indicator on the dash when it kicks in. However, when you're towing or hauling a heavy payload, MDS almost never activates because the engine needs all eight cylinders just to keep the momentum going.
Why Choose Gas Over Diesel Anyway?
If the fuel economy is so much lower than the Cummins diesel version, why do so many people stick with the 6.4L gas engine? It really comes down to how you use the truck and your budget.
First, there's the upfront cost. The Cummins diesel engine is a roughly $9,500 to $10,000 upgrade over the gas V8. You have to drive a lot of miles to make up that price difference in fuel savings. Then there's the cost of maintenance. Diesel engines require more expensive oil changes, fuel filter replacements, and the constant addition of Diesel Exhaust Fluid (DEF).
If your daily routine involves a lot of short trips around town, a gas engine is actually a much better choice. Modern diesels with complex emissions systems don't like short trips; they need to get up to operating temperature and stay there to keep the filters clean. The 6.4L Hemi doesn't care if you're just driving three miles to the hardware store. It's simpler, cheaper to maintain, and offers a higher payload capacity because the engine itself is much lighter than the heavy iron-block diesel.
Small Ways to Squeeze More Miles per Gallon
While you're never going to turn this truck into a fuel-efficient commuter car, there are ways to keep the 2024 ram 2500 6.4 mpg from bottoming out.
- Watch Your Speed: The biggest enemy of fuel economy in a heavy-duty truck is wind resistance. The difference between driving 70 mph and 80 mph can be as much as 2 or 3 mpg. Keeping it around the speed limit is the easiest way to save gas.
- Tire Pressure: It sounds basic, but keeping those big tires properly inflated makes a difference. Under-inflated tires create more rolling resistance, which forces the engine to work harder.
- The Rear Axle Ratio: When you buy or order a 2024 Ram 2500, you usually have a choice between a 3.73 and a 4.10 rear axle ratio. If fuel economy is a concern and you aren't towing near the maximum limit every day, the 3.73 gears will give you better mpg on the highway by keeping the engine RPMs lower.
- Avoid Excessive Idling: It's tempting to let the truck run while you're "just popping in" somewhere, especially in the winter or summer to keep the cab comfortable. But a big 6.4L engine burns a surprising amount of fuel just sitting there doing nothing.
Is the 2024 Ram 2500 Right for You?
At the end of the day, the 2024 ram 2500 6.4 mpg is what it is. It's the trade-off for having a truck that can haul over 3,000 pounds in the bed and tow upwards of 17,000 pounds without breaking a sweat. If you're looking for a truck that feels solid, has a great interior (Ram is still winning the interior game, in my opinion), and offers a reliable, time-tested powertrain, the 6.4L Hemi is a solid bet.
Yes, you'll spend more time at the gas station than the guy in the half-ton truck next to you. And yes, seeing "9.5 mpg" on the digital display while pulling a hill can be a bit painful. But for many owners, the simplicity of the gas engine and the lower entry price make it the smarter financial move over the long haul.
Just go into the purchase with your eyes open. If you're okay with averaging 12 or 13 mpg in daily use, you're going to love this truck. It's powerful, it's capable, and it's built to do the heavy lifting that smaller trucks just can't handle. Just maybe don't look too closely at the "dollars spent" column on your fuel app—some things are better left uncalculated.