22 MPG combined for the 2018 Ram 1500 4WD 3.0L EcoDiesel isn’t going to win any hypermiling contests, but it’s a surprisingly respectable figure when you consider what this truck *is*: a capable, body-on-frame pickup designed to haul materials, tow trailers, and generally handle tasks that would make a crossover shudder. A crew cab 4×4 pickup with a torquey diesel isn’t typically associated with frugality, but this Ram powertrain configuration offers a blend of utility and relative efficiency.

City and highway performance

The EPA estimates the 2018 Ram 1500 EcoDiesel 4×4 at 19 MPG in the city and 27 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the truck’s weight and aerodynamic limitations come into play. That 27 MPG highway figure, however, highlights the EcoDiesel’s strength: relaxed cruising at highway speeds. The eight-speed automatic transmission helps here too, allowing the engine to operate in its most efficient range. Those buying this particular Ram configuration often value relaxed highway cruising and occasional long-distance towing; in those situations, the EcoDiesel’s fuel economy advantage becomes clear compared to the gasoline V8 options.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Ram 1500 EcoDiesel 4×4 at $2,550. This figure is based on driving 15,000 miles per year and using national average fuel prices. Diesel fuel prices can fluctuate significantly, and your actual fuel costs will depend on your driving habits, location, and the prevailing diesel prices in your area. While $2,550 is a substantial sum, it reflects the tradeoff inherent in owning a full-size pickup with 4-wheel drive capability; those who need the capability this Ram offers often see the fuel cost as a necessary part of the ownership equation.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy usually varies, and that’s especially true with pickups. Factors like driving style, cargo weight, towing, and even tire pressure can significantly impact the fuel consumption of the 2018 Ram 1500 EcoDiesel.

Drivers who prioritize fuel economy and adopt a gentle driving style, avoid excessive idling, and perform regular maintenance are more likely to achieve figures closer to the EPA estimates. Conversely, those who frequently tow heavy loads, drive aggressively, or neglect maintenance will likely see their fuel economy drop noticeably. Hauling heavy loads or navigating off-road terrain, in particular, will significantly increase fuel consumption.

How it compares

Compared to other full-size pickups available in 2018, the Ram 1500 EcoDiesel 4×4 stands out for its relatively low fuel consumption. A comparable gasoline-powered Ram 1500 4×4 with the 5.7L Hemi V8 delivered combined MPG of 17. The Ford F-150 4×4 with the 2.7L EcoBoost V6 achieved around 20 MPG combined, slightly better than the Ram in the city but not on the highway. The Chevrolet Silverado 1500 4×4 with the 5.3L V8 hovered around 18 MPG combined. For buyers focused on fuel efficiency alongside towing and hauling, the EcoDiesel offered a clear advantage and perhaps the best of all Ram 1500 MPG across all years, making the diesel power plant an attractive choice.

Tips to maximize efficiency

Keep your tires properly inflated to the recommended pressure. Low tire pressure increases rolling resistance, forcing the engine to work harder and burn more fuel. This is especially important on a heavy vehicle like the Ram 1500, where rolling resistance has a stronger effect.

Avoid aggressive acceleration and braking. The EcoDiesel engine produces ample torque at low RPMs, so there’s no need to stomp on the accelerator to get up to speed. Smooth, gradual acceleration will help conserve fuel and improve your overall MPG.

Reduce idling time. Idling consumes fuel without covering any distance. If you anticipate being stationary for more than a minute or two, turn off the engine. The EcoDiesel, being a diesel, takes longer to warm up from a cold start, but prolonged idling is still wasteful.

Use cruise control on the highway. Cruise control helps maintain a consistent speed, minimizing unnecessary acceleration and deceleration. Also, consider using the vehicle’s “eco” mode, if equipped, to further optimize fuel efficiency for steady-state driving.

Ensure regular maintenance is performed. A properly maintained engine runs more efficiently. Follow the manufacturer’s recommended maintenance schedule for oil changes, air filter replacements, and other services. Refer to all Ram fuel economy data to ensure proper vehicle care to maximize your fuel economy.