18 MPG combined is a stark reality check for those drawn to the 2015 Jaguar XJL FFV with its sonorous 5.0L V8. This isn’t a car bought for its thriftiness; it’s a statement, a rolling expression of refined taste and unabashed love for old-school performance. The XJL buyer prioritizes the experience, the opulent leather, the effortless surge of power, the prestige of the leaping cat, and accepts the fuel bill as the cost of admission.

City and highway performance

The EPA estimates for the XJL’s urban and open-road consumption are 15 MPG in the city and 23 MPG on the highway. The stark contrast reflects the engine’s fuel-thirsty nature when navigating stop-and-go traffic, versus its ability to cruise relatively efficiently at higher, constant speeds. The eight-speed automatic transmission helps manage fuel consumption on the highway. However, the engine’s displacement and power output ultimately dictate the MPG figure. Consider that other large luxury sedans with smaller, more modern engines often achieve better city fuel economy.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2015 Jaguar XJL FFV is $3,200. This figure is based on driving 15,000 miles per year and using national average fuel prices. It’s a considerable expense, placing the XJL at the higher end of the fuel cost spectrum compared to other vehicles in its class and even to some larger SUVs. This number should be carefully considered by potential buyers, as it represents a significant ongoing cost in addition to the purchase price, insurance, and maintenance.

Real-world expectations

The official EPA numbers provide a useful baseline, but real-world fuel economy can vary significantly depending on driving habits, road conditions, and maintenance. Expect to see figures slightly lower than the EPA estimates if you frequently engage in spirited driving or spend a majority of your time in stop-and-go traffic. Conversely, if you primarily drive on the highway and practice fuel-efficient driving techniques, you might see numbers that are closer to, or even slightly above, the EPA rating. Some owners of the 2015 Jaguar XJL FFV never see figures close to 23 MPG, and they might not prioritize fuel economy at all.

How it compares

The 2015 XJL’s fuel economy lags behind many of its competitors. For example, the 2015 BMW 740i, with its turbocharged inline-six engine, manages a combined 25 MPG, whereas the Mercedes-Benz S550 from the same model year clocks in at 20 MPG combined. Even the more powerful S63 AMG still lands at 18 MPG despite having much more power. Even within the Jaguar range you’ll find much better figures, so check all Jaguar fuel economy data before buying. The Audi A8, a known competitor often cross-shopped against the XJL, offers significantly better mileage, with the 3.0T V6 variant achieving around 22 MPG combined. For some, the trade-off is worth it given the XJL’s distinct styling and the unique character of its V8 engine. But for those seeking a more fuel-efficient luxury sedan, alternatives exist.

Tips to maximize efficiency

While the 2015 Jaguar XJL FFV isn’t inherently a fuel-efficient vehicle, a few strategies can help to optimize its economy. Smooth acceleration and gentle braking are crucial. Avoiding sudden bursts of speed and anticipating traffic flow allows the engine to operate more efficiently and minimizes fuel wastage.

Regular maintenance, including tire inflation and timely oil changes, is important for maintaining peak efficiency. Underinflated tires increase rolling resistance, while old or dirty oil can reduce engine performance. Follow the manufacturer’s recommended maintenance schedule to keep the engine running smoothly.

Minimize idling. Idling burns fuel without covering any distance, so avoid unnecessary idling, especially during extended stops. If you plan to stop for more than a minute or two, turn off the engine. This is particularly important in urban environments where idling is more frequent.

Consider the driving mode settings. Many XJL models feature selectable driving modes that can prioritize fuel efficiency. Selecting “Eco” or a similar mode may adjust engine and transmission settings to optimize fuel economy, albeit at the expense of some performance. A quick trip through XJL MPG across all years might help you decide whether this is the car for you.