Few people buy a 2018 Jaguar XJ 3.0L because of its 21 MPG combined. It’s a flagship luxury sedan, designed to surround its occupants in supple leather and effortless power. Drivers value a smooth ride, a growling exhaust note, and envious glances far more than they value squeezing an extra mile out of each gallon. The XJ is for executives, captains of industry, and individuals who prioritize experience over economy.

City and highway performance

The EPA rates the 2018 Jaguar XJ equipped with the 3.0-liter supercharged V6 at 18 MPG in the city and 27 MPG on the highway. The eight-speed automatic transmission helps manage power delivery efficiently, optimizing fuel consumption while still providing brisk acceleration when needed. In urban environments, the XJ’s weight and strong engine contribute to its thirst, while on the open road, the efficient transmission and aerodynamic profile allow it to achieve a respectable highway figure, considering its size and performance capabilities.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Jaguar XJ 3.0L will be $2,750. This is based on driving 15,000 miles per year and using the national average fuel price at the time of calculation. Of course, the actual cost will vary depending on individual driving habits and fluctuations in gasoline prices, however, it provides a useful benchmark for potential owners to consider. Buyers interested in lowering their fuel costs can explore all Jaguar fuel economy data to see how other models compare. For details on how the XJ has changed over time, check out XJ MPG across all years.

Real-world expectations

While the EPA figures offer a standardized measure, real-world fuel economy often differs. An XJ is not typically driven with fuel efficiency as the primary concern. Expect the city MPG to dip even lower with aggressive driving or frequent short trips. However, on long highway journeys with consistent speeds, achieving, or even slightly exceeding the EPA’s 27 MPG is certainly possible. Careful driving habits can significantly influence the XJ’s economy, but ultimately, its performance character will tempt many owners to tap into the supercharged V6’s reserves, impacting fuel consumption.

How it compares

In the realm of full-size luxury sedans, the 2018 Jaguar XJ holds its own, but it’s not a fuel economy leader. The Mercedes-Benz S560, with its turbocharged V8, achieves a slightly better 19 MPG city and 28 MPG highway. The BMW 740i, featuring a turbocharged inline-six, fares a bit better at 21 MPG city and 29 MPG highway. Perhaps the closest competitor regarding driving experience, the Maserati Quattroporte with its base V6, posts comparable numbers around 17 MPG city and 24 MPG highway. These comparisons matter because even within this segment, some buyers may reluctantly consider efficiency when choosing between otherwise similar vehicles. For those concerned about MPG, the XJ’s numbers might be a slight consideration, but rarely a deal-breaker.

Tips to maximize efficiency

Anticipate traffic flow and avoid aggressive acceleration. The XJ’s supercharged engine is eager, but a gentle foot on the accelerator will significantly reduce fuel consumption. Smooth, predictable driving will allow the transmission to shift efficiently and keep the engine operating in its most economical range.

Ensure proper tire inflation. Maintaining the recommended tire pressure reduces rolling resistance, improving fuel economy. Check your tire pressure regularly, especially when temperatures fluctuate, as this can affect pressure levels. Consult the sticker on the driver’s side doorjamb for the correct pressure.

Minimize idling. Modern engines do not require extensive warm-up periods. Excessive idling wastes fuel unnecessarily. Turn off the engine if you anticipate waiting for more than a minute or two. The supercharged V6 heats up quickly, so there’s no need to let it run while stationary.

Take advantage of cruise control on the highway. Cruise control helps maintain a consistent speed, preventing unnecessary acceleration and deceleration, which improves fuel economy. With the XJ’s advanced driver assistance systems, it’s even easier to maintain a safe and efficient speed on long journeys.