24 MPG combined isn’t going to win any green awards, but in the context of the 2016 Porsche Cayenne Diesel, it balances Porsche performance and luxury without completely emptying your wallet at the pump. This isn’t a hybrid designed for hypermiling; it’s a V6-powered SUV built for effortless cross-country cruising and occasional towing while maintaining a level of refinement expected from the Porsche crest. These buyers prioritize capability, badge appeal, and driving enjoyment over saving on gas, but don’t want to feel like they’re throwing money away.

City and highway performance

The EPA estimates the 2016 Cayenne Diesel at 21 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the diesel’s weight and stop/start system are more challenged.

However, the highway number is where the Cayenne Diesel shines. That 28 MPG allows for long distances between fill-ups, aided by the standard eight-speed automatic transmission that keeps the engine running in its most efficient range at highway speeds.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2016 Porsche Cayenne Diesel at $2,300. This calculation assumes 15,000 miles of driving per year, with a mix of city and highway miles, using national average fuel prices. Of course, your actual fuel costs will vary depending on your driving habits, the specific type of diesel fuel you purchase, and where you live, as fuel prices fluctuate regionally.

Real-world expectations

While the EPA’s numbers are a useful benchmark, real-world fuel economy often differs. Cayenne Diesel owners report figures close to the EPA estimates. Factors like aggressive driving, towing, and prolonged idling can significantly reduce fuel efficiency.

Consistent highway driving at moderate speeds can sometimes yield better-than-expected results. The diesel engine’s broad torque band encourages relaxed driving, which can help in achieving those higher numbers.

How it compares

Compared to its competitors, the 2016 Cayenne Diesel sits in a reasonable position. The gasoline-powered 2016 BMW X5 xDrive35i is rated at 20 MPG combined. The Audi Q7 3.0T, another popular choice in this segment, achieves 21 MPG combined.

Hybrid SUVs, like the Lexus RX 450h at 30 MPG combined, offer better fuel economy, but they lack the Cayenne Diesel’s towing capacity and driving dynamics. Shoppers can find all Porsche fuel economy data right here if they’re curious about other Porsche models.

Tips to maximize efficiency

Take it easy on the accelerator. The Cayenne Diesel’s torque means you don’t need to bury your foot to get up to speed. Gradual acceleration will significantly reduce fuel consumption, especially in city driving. The engine’s ample low-end grunt allows you to reach cruising speed with minimal effort.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended levels found on the driver’s side doorjamb. This simple step can make a noticeable difference.

Avoid excessive idling. Diesel engines are less susceptible to fuel wastage from idling compared to gasoline engines, but prolonged idling still consumes fuel unnecessarily. If you’re stopped for more than a minute, it’s generally more efficient to turn off the engine. The Cayenne’s automatic stop/start assists with this in many situations.

Minimize aerodynamic drag. Remove roof racks or cargo carriers when they’re not in use, as they increase wind resistance and reduce fuel economy, particularly at highway speeds. Ensure all windows are fully closed, as open windows can disrupt airflow and negatively impact fuel consumption. You can also see CAAYENNE MPG across all years for additional insights.

Use cruise control on the highway. Cruise control helps maintain a consistent speed, preventing unnecessary acceleration and deceleration that waste fuel. This is especially effective on long, relatively flat stretches of road. Fuel usage becomes more consistent by keeping the transmission from erratic shifting.