24 MPG combined from the 2018 Jeep Grand Cherokee 4WD 3.0L diesel isn’t going to win any hypermiling contests, but it is perfectly acceptable for what this vehicle is: a capable and comfortable SUV that prioritizes ruggedness and towing over outright fuel efficiency. Buyers considering this specific configuration aren’t primarily focused on pinching pennies at the pump, they need a dependable vehicle that can handle demanding tasks and challenging terrain, while still offering a premium interior and a smooth ride.

City and highway performance

The EPA estimates for the 2018 Grand Cherokee 4WD 3.0L diesel reveal a split of 21 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go driving conditions and the inherent inefficiencies of a larger, heavier vehicle navigating urban environments. The highway MPG is more respectable, owing to the diesel engine’s efficiency at sustained speeds and the eight-speed automatic transmission’s ability to keep the engine in its optimal power band. This spread suits drivers who spend a moderate amount of time commuting in urban areas but also frequently take longer road trips or weekend adventures. The diesel’s strong torque also contributes to its perceived efficiency, as it requires less aggressive throttle input to maintain speed, especially when towing.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Jeep Grand Cherokee 4WD 3.0L diesel to be $2,300. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price at the time of calculation. Keep in mind that fluctuations in fuel prices can significantly impact this number, so it’s essential to factor in current diesel costs in your area when budgeting for vehicle ownership.

Real-world expectations

While the EPA provides a standardized test, real-world MPGs can vary based on several factors. Driving style is a major influencer: aggressive acceleration and hard braking will noticeably reduce fuel economy.

Terrain also plays a significant role, driving in hilly or mountainous areas demands more power from the engine, decreasing efficiency. Towing, a common use case for the Grand Cherokee diesel, will have a substantial negative impact on MPG. Regular maintenance, including proper tire inflation and timely oil changes, can help ensure the engine operates at peak efficiency and maximize fuel economy.

How it compares

In the segment of mid-size SUVs with available diesel engines, the 2018 Grand Cherokee 4WD 3.0L diesel holds its own. Consider the previous-generation VW Touareg TDI (no longer available new), which offered comparable MPG numbers. While some modern gas-engine SUVs, like a Toyota Highlander Hybrid might boast slightly higher combined MPG (around 35 MPG), they lack the Grand Cherokee’s diesel’s reliable towing capability and off-road prowess. Other competitors like the Land Rover Discovery with a diesel engine (if available in a given model year) may offer similar fuel economy numbers, but often come with a higher price tag and potentially higher maintenance costs.

For someone prioritizing a balance of capability, fuel efficiency, and ruggedness, the Grand Cherokee diesel is worthy of consideration, justifying its fuel economy compared to more purely efficiency-focused crossovers.

Tips to maximize efficiency

The 3.0L diesel benefits from consistent driving habits. Avoid abrupt acceleration and maintain a steady speed whenever possible. Using cruise control on the highway can help minimize fuel consumption by preventing unnecessary speed fluctuations. The eight-speed automatic transmission is smart, but sometimes a gentle foot avoids unnecessary downshifts.

Regularly check and maintain proper tire inflation pressures. Underinflated tires increase rolling resistance, which directly impacts fuel economy. Refer to the sticker on the driver’s side doorjamb for the recommended pressure.

Reduce unnecessary weight in the vehicle. Hauling around heavy items that you don’t need can negatively affect MPG. A lighter vehicle requires less energy to accelerate and maintain speed.

Minimize idling. Modern engines don’t need to warm up for extended periods. Excessive idling wastes fuel. If you anticipate being stopped for more than a minute, it’s generally more efficient to turn off the engine.

Consider using the vehicle’s Eco mode, if equipped. This mode typically adjusts throttle response and transmission shift points to prioritize fuel efficiency over performance. Understand that this may slightly reduce acceleration, but it can contribute to incremental fuel savings over time. Browse all Jeep fuel economy data or even GRAND MPG across all years to learn more.