21 MPG combined for the 2019 Porsche Cayenne e-Hybrid 3.0L 6-cyl doesn’t exactly scream “fuel sipper,” but that’s hardly the point. This is a Porsche, first and foremost, and its hybrid powertrain is more about boosting performance and offering limited electric-only driving than chasing Prius-like efficiency numbers.

City and highway performance

The EPA estimates the Cayenne e-Hybrid at 20 MPG in the city and 22 MPG on the highway. While these figures might seem low compared to other hybrid SUVs, understand that the Cayenne occupies a unique space. Buyers aren’t cross-shopping this with a Toyota RAV4 Prime; they’re considering it against other performance-oriented SUVs. The V6 engine combined with the electric motor provides a compelling level of power and responsiveness, and the ability to drive short distances on electric power alone contributes to the city MPG.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Porsche Cayenne e-Hybrid at $2,750. This figure is based on driving 15,000 miles per year, with a certain percentage of those miles driven in the city versus on the highway, and assumes current national average fuel prices. While a considerable sum, potential owners should consider how much they will drive in pure electric mode by keeping the batteries charged.

Real-world expectations

Real-world fuel economy for the Cayenne e-Hybrid can vary widely depending on driving style, charging habits, and the types of roads driven. If you diligently plug in and maximize electric-only range, particularly for shorter commutes, you’ll see a significant improvement over the EPA estimates. Conversely, if you frequently exploit the combined horsepower, expect the MPG to decline accordingly. This vehicle rewards a mindful approach to driving and energy management.

How it compares

Compared to its competitors, the Cayenne e-Hybrid occupies a middle ground. The BMW X5 xDrive45e, another plug-in hybrid SUV, achieves around 20 MPG combined, similar to the Cayenne. A non-hybrid Cayenne S, with its twin-turbo V6, delivers around 19 MPG combined, illustrating the hybrid’s slight advantage. Buyers prioritising fuel economy might also consider the Lexus RX 450h, which achieves around 31 MPG combined, but they make this choice knowing that the Lexus does not offer the same level of performance or prestige as the Porsche. To see all Porsche fuel economy data you can browse the site, and similarly find data for CAYENNE MPG across all years.

Tips to maximize efficiency

Use the electric-only driving mode whenever possible. Short trips around town are ideal for maximizing fuel savings. Charging regularly is key to achieving the best possible fuel economy. Keep it plugged in at home overnight so that the petrol engine does not kick-in on your shorter commutes.

Avoid aggressive acceleration and braking, especially when not using the electric motor as this will consume more fuel. The Cayenne e-Hybrid is a fast vehicle, but smooth and gradual inputs will help conserve energy and optimize MPG.

Pay attention to the Cayenne’s driving modes. Select the “Hybrid Auto” mode often, as it manages the balance between electric and petrol power for optimal efficiency based on driving conditions. Familiarize yourself with the car’s other modes such as “E-Hold”, “E-Charge”, and “Sport”. Using “E-Hold” will preserve your battery charge, while “E-Charge” will actively recharge it. Both can deplete petrol more quickly than “Hybrid Auto”, but knowing how to use them is key to your journey.

Ensure your tires are properly inflated. Under-inflated tires increase rolling resistance, which hurts fuel economy. Check your tire pressure regularly and inflate to the recommended pressure listed on the door jamb.