15 MPG combined: It’s a number that would sink most vehicles, but for the 2016 Jeep Grand Cherokee SRT8 4WD with the 6.4L V8, it’s almost beside the point. This isn’t transportation for those overly concerned with their carbon footprint. This is a high-performance SUV that trades efficiency for raw power, aggressive styling, and the capability to embarrass sports cars at the drag strip while still hauling the kids and their soccer gear. The SRT8’s mission is clear, and fuel economy plays a distant second to outright performance.

City and highway performance

Breaking down that combined 15 MPG, the EPA estimates 13 MPG in the city and 19 MPG on the highway. The city figure reflects the engine’s substantial displacement and the stop-and-go conditions that heavily tax fuel efficiency. The highway number, while still not stellar, offers a glimpse of the engine’s potential when cruising at a constant speed. However, the temptation to tap into that readily available horsepower often negates any potential gains. Anyone who buys this vehicle and drives it “normally” is missing the point. Drivers should understand the GRAND MPG across all years before deciding if this is acceptable to them.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,850 for the 2016 Grand Cherokee SRT8. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Of course, actual fuel costs can vary significantly depending on individual driving habits, local fuel prices, and the type of fuel used. High-performance engines often require premium gasoline, which adds to the overall expense.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the SRT8 is often lower. Aggressive driving, frequent use of launch control, and extended idling can all dramatically reduce fuel efficiency. Owners who regularly engage in performance driving should expect to see numbers closer to the city estimate, or even lower. It’s rare to see owners of this vehicle achieve the EPA’s highway estimate without making a concerted effort to drive conservatively.

How it compares

Compared to other performance SUVs, the Grand Cherokee SRT8’s fuel economy is predictably poor. The BMW X5 M, with its twin-turbocharged V8, manages around 16 MPG combined. The Mercedes-AMG GLE 63 S, another high-performance competitor, achieves similar numbers. Even other trims of the Grand Cherokee itself offer significantly better fuel economy. A Grand Cherokee with the 3.6L V6 engine, for instance, can achieve upwards of 22 MPG combined. However, those models lack the visceral thrill and outright performance of the SRT8. The Dodge Durango SRT, with the same 6.4L Hemi, has similar MPG numbers, but is also a larger vehicle. Someone who cross-shops these vehicles is likely focused on performance and style over fuel efficiency.

Tips to maximize efficiency

While squeezing maximum MPG from an SRT8 might seem like a contradiction, there are still a few things owners can do to slightly improve fuel economy. Avoid aggressive acceleration and braking. Gradual changes in speed are more fuel-efficient than sudden bursts of power, and this will spare wear on the brakes and tires.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. The SRT8’s high-performance tires are particularly sensitive to pressure, so check them regularly and maintain the recommended levels.

Minimize idling. Letting the engine idle for extended periods consumes fuel without moving the vehicle. If you’re stopped for more than a minute, it’s generally more efficient to turn off the engine. Be mindful of leaving the vehicle on to run accessories like the air conditioning for extended periods.

Consider using a lighter touch with the throttle. The 6.4L Hemi is incredibly responsive, and it’s easy to unintentionally use more power than necessary. Practice smooth and controlled throttle inputs to minimize fuel consumption. While you’re at it, read more about all Jeep fuel economy data.