18 MPG combined reflects a clear choice. No one buys a 2017 Jaguar XJL with the 5.0L V8 expecting Prius-like efficiency. They buy it for the easy power, the distinctive exhaust sound, and the sheer presence of a long-wheelbase Jaguar sedan. Fuel economy is simply a cost of ownership.

City and highway performance

The EPA estimates of 15 MPG in the city and 23 MPG on the highway are useful but can vary. Actual mileage depends greatly on driving style and traffic. The city figure will likely drop in stop-and-go traffic, where the large V8 works hard to move a heavy car. However, the highway number is achievable, even beatable, if you cruise gently and use the smooth-shifting eight-speed automatic transmission. This car is designed for easy long-distance driving, not aggressive cornering on public roads.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Jaguar XJL 5.0L V8 at $3,200. This is based on driving 15,000 miles per year, using national average fuel prices. Individual costs will change depending on driving habits and local fuel prices, but $3,200 is a baseline. It’s a considerable amount, but most XJL owners likely factor it into the cost of owning a luxury vehicle. It’s the price for access to a powerful engine and a uniquely luxurious experience. If this number worries you, checking XJL MPG across all years might reveal more efficient choices.

Real-world expectations

Away from EPA testing, real-world fuel economy often differs from the official numbers. Aggressive driving, frequent short trips, and even tire pressure can greatly affect your MPG. XJL owners who drive smoothly, anticipate traffic, and keep their tires inflated will probably see numbers closer to the EPA. On the other hand, those who often use the engine’s power will see a noticeable decrease. Join online Jaguar forums to compare actual MPG with other owners in similar conditions.

How it compares

The 2017 XJL 5.0L V8’s fuel economy isn’t class-leading compared to competitors. The BMW 750i xDrive, with its 4.4L V8, gets a combined 19 MPG. The Mercedes-Benz S550, with a 4.7L V8, achieves 20 MPG combined. Even the Audi A8 4.0T, with its twin-turbo V8, gets around 22 MPG combined. These small differences can increase over time. The XJL’s lower fuel economy is partly due to Jaguar’s focus on a more visceral driving experience with a naturally aspirated engine. The lack of turbochargers creates a more linear throttle response and a distinctive Jaguar sound, which reduces fuel efficiency. If fuel economy is a major concern, understanding all Jaguar fuel economy data is important. However, for those who prize exclusivity and driving feel, the XJL remains a strong option.

Tips to maximize efficiency

Avoid hard acceleration. The 5.0L V8 is responsive, but every hard start or burst of speed uses a lot of fuel. Accelerate smoothly and gradually to decrease fuel use, especially in city driving. This improves MPG and creates a more relaxed driving experience suited to the XJL.

Correct tire inflation is important for fuel economy. Check your tire pressure often and be sure it matches the recommended levels on the driver’s side doorjamb. Underinflated tires increase rolling resistance, which makes the engine work harder and burn more fuel. Proper tire pressure also improves handling and extends tire life.

Use cruise control on the highway. Keeping a steady speed maximizes fuel efficiency. Cruise control prevents unnecessary acceleration and deceleration, which can waste fuel on long trips. Watch traffic and turn off cruise control when needed to keep a safe distance.

Reduce idling. Letting the engine idle for long periods wastes fuel without moving. If you’ll stop for more than a minute, turn off the engine. Modern engines start quickly, so restarting is usually more efficient than idling.

Regularly service your car. A well-maintained engine runs better. Follow the manufacturer’s maintenance schedule, including regular oil changes, air filter replacements, and spark plug checks. These steps can improve engine performance and increase fuel economy.