18 MPG combined is what you can expect when driving the 2015 Jaguar XJ 5.0L. This isn’t a car for everyone, especially those focused on getting maximum MPG. The XJ 5.0L makes a statement. It’s a rolling example of British luxury and performance. Buyers likely aren’t seeking Prius-level efficiency. They want the thrill of a supercharged V8 and the luxurious comfort that a flagship Jaguar provides. They accept this fuel consumption as the cost for the XJ’s unique character and driving experience.

City and highway performance

The EPA estimates the 2015 Jaguar XJ 5.0L gets 15 MPG in the city. Stop-and-go traffic uses more fuel, and makes the V8 work harder from a standstill. On the open road, the XJ does better, achieving 23 MPG on the highway. This is more respectable and easily achievable on longer trips. Drivers can enjoy the XJ’s comfortable cruising ability without constantly watching the fuel gauge. Remember that aggressive driving will lower both city and highway MPG.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2015 Jaguar XJ 5.0L. This is based on driving 15,000 miles per year, using the national average fuel price. Fuel costs will vary depending on driving habits and local fuel prices. Drivers who accelerate quickly or primarily drive in congested city environments will likely exceed that $3,200 figure. On the other hand, those who mostly drive on the highway may spend less. Consider this estimate a guideline, not a precise prediction.

Real-world expectations

While the EPA estimates provide a useful reference point, individual fuel economy can vary. Real-world MPG depends on driving style, traffic, and even tire inflation. Quick acceleration and frequent hard braking will hurt fuel economy considerably. Driving smoothly and anticipating traffic can lead to better results. Terrain also matters. Driving in hilly or mountainous areas will decrease MPG compared to flat roads. Don’t expect to consistently match the EPA numbers, but understanding these factors can help you get better mileage.

How it compares

The 2015 Jaguar XJ 5.0L lags behind its competitors in fuel economy. The BMW 750i from the same year achieves a combined rating of 20 MPG, while the Mercedes-Benz S550 manages 21 MPG. The Audi A8, with its quattro all-wheel-drive system, is better than the XJ at 22 MPG combined. These rivals offer similar levels of luxury and performance, but cost less to fuel. However, the XJ provides a unique Jaguar driving experience and design, a key factor for brand loyalists who care less about fuel.

You can access XJ MPG across all years here. For broader comparisons, browse all Jaguar fuel economy data on other models.

Tips to maximize efficiency

Regular maintenance is important to get the best fuel efficiency from your 2015 Jaguar XJ 5.0L. Make sure the engine is properly tuned and all scheduled maintenance is done according to the manufacturer’s recommendations. This includes regular oil changes, air filter replacements, and spark plug maintenance, as these affect engine performance and fuel consumption.

Monitor your tire pressure. Underinflated tires increase rolling resistance, making the engine work harder and reducing fuel economy. Check your tire pressure at least once a month and before long trips. Make sure they are inflated to the recommended pressure listed on the doorjamb.

Avoid aggressive driving habits. Rapid acceleration, hard braking, and high speeds use more fuel. Drive more smoothly, anticipate traffic, and maintain a consistent speed. Using cruise control on the highway helps you maintain a more consistent speed, which will increase fuel efficiency.

Minimize idling. Idling consumes fuel without traveling. If you expect to be stopped for more than a minute or two, turn off the engine. Restarting the engine uses less fuel compared to extended idling, especially with modern engines.