18 MPG combined probably won’t matter much to the buyer considering the 2015 Jaguar XK Convertible with its captivating 5.0L V8. This isn’t a car purchased for penny-pinching fuel efficiency; it’s a statement, a visceral experience, and a celebration of open-top motoring steeped in British heritage and powered by a glorious engine. The XK Convertible buyer prioritizes the symphony of the V8, the timeless elegance of its design, and the wind-in-hair thrill far above any concerns about filling the tank. For them, the MPG is simply a footnote.

City and highway performance

The XK Convertible’s EPA ratings reflect its performance capabilities. Its 16 MPG city and 22 MPG highway ratings reveal a character that’s more at home eating up miles on a scenic coastal route than navigating stop-and-go traffic. The reliable 5.0L V8, mated to a six-speed automatic transmission, delivers effortless power, making overtaking maneuvers a breeze. While the transmission provides smooth shifts, it lacks the fuel-saving advancements of more modern eight- or ten-speed units, contributing to the car’s less-than-stellar fuel economy. Anyone desiring better MPG might consider searching past model years for related models with improved fuel economy, such as the XK MPG across all years.

Annual fuel cost

According to EPA estimates, the annual fuel cost for the 2015 Jaguar XK Convertible 5.0L 8-cyl is $3,200. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel prices at the time of calculation. Keep in mind that this is merely an estimate, and your actual fuel costs may vary significantly depending on your driving habits, local fuel prices, and the type of fuel you use. The “official” EPA fuel type for this vehicle is unspecified; however, premium gasoline will be needed for the engine to operate at peak performance.

Real-world expectations

While the EPA ratings provide a baseline, real-world fuel economy for the XK Convertible is highly dependent on individual driving styles. Those who frequently exploit the V8’s impressive acceleration and revel in its throaty exhaust note can expect figures closer to the city rating, or even lower.

More relaxed drivers, particularly those favoring longer highway journeys, might achieve closer to the EPA’s 22 MPG highway estimate. This car encourages spirited driving, and resisting the urge to tap into its power will require significant restraint to see any fuel savings.

How it compares

Compared to its contemporaries, the XK Convertible’s fuel economy sits firmly in the realm of “thirsty.” The BMW 650i Convertible from the same year, with its equally potent V8, achieves a slightly better 17 MPG city and 25 MPG highway. The Mercedes-Benz SL550, another direct competitor, lands in a similar range, with an estimated 17 MPG city and 24 MPG highway. These differences, while noticeable on paper, are unlikely to sway a buyer already enamored with the Jaguar’s unique blend of performance and style. Drivers should check all Jaguar fuel economy data though for further information.

Tips to maximize efficiency

While fuel efficiency might not be the primary concern for XK Convertible owners, there are still steps that can be taken to minimize fuel consumption without sacrificing the driving experience entirely. Regular maintenance, including properly inflated tires and clean air filters, ensures the engine operates at peak efficiency. Neglecting these basics can subtly impact fuel economy over time.

Anticipate traffic flow and avoid aggressive acceleration and braking. The XK Convertible’s powerful engine responds quickly to throttle inputs, but smooth and deliberate driving will conserve fuel. Resist the urge to constantly rev the engine simply to enjoy its sound; those auditory delights come at a price.

Consider using cruise control on long highway drives, as this helps to maintain a constant speed and reduce unnecessary acceleration. And minimize idling time, as the XK’s large engine burns a surprising amount of fuel even when stationary. Turning off the engine during prolonged stops can make a small but cumulative difference.

Keep the convertible top raised at higher speeds. While open-top motoring is a key part of the XK Convertible’s appeal, the increased aerodynamic drag at highway speeds results in a noticeable drop in fuel economy. Save the top-down experience for slower, more leisurely drives.