22 MPG combined is almost beside the point for the 2017 Cadillac XTS with the 3.6L V6. This isn’t a car bought and sold because of exceptional fuel efficiency. It’s a large, comfortable sedan focused on traditional luxury, aimed at a buyer who prioritizes space, a smooth ride, and a certain understated elegance above all else. Fuel economy is a consideration, certainly, but it’s further down the list than those core attributes.

City and highway performance

The EPA estimates the XTS at 18 MPG in the city and 28 MPG on the highway. That spread reflects the engine’s characteristics. Around town, the big V6 has to work harder moving the substantial weight of the XTS, causing fuel consumption to rise. On the open road, however, where the engine can settle into a more relaxed cruise, the efficiency improves noticeably. The six-speed automatic transmission also plays a role, prioritizing a smooth ride over outright speed, and keeping the engine in its sweet spot on the highway.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Cadillac XTS 3.6L at $2,000. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and assumes national average fuel prices. Individual costs will vary depending on actual driving habits and local fuel prices. If you spend most of your time in stop-and-go traffic, expect to exceed that amount. Conversely, primarily highway driving could lower it.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy can vary significantly. Aggressive driving, frequent short trips, and carrying extra weight in the car can all negatively impact fuel consumption. Similarly, factors like tire pressure and ambient temperature can play a role. Keep these factors in mind when assessing whether the XTS suits your needs. Some drivers see numbers close to the EPA estimates, but it’s important to understand the variables involved. You can also find XTS MPG across all years to give yourself a broader perspective.

How it compares

Compared to other large sedans, the 2017 Cadillac XTS lands in the middle of the pack. The Lincoln Continental with its 3.7L V6 manages a similar 19 city / 28 highway. The Chrysler 300 with the 3.6L V6 achieves a slightly better 19 city / 30 highway. However, the XTS prioritizes a plush ride and interior space over outright fuel efficiency, and these alternatives may not offer the same level of comfort and refinement. For those considering other Cadillac models, you can find all Cadillac fuel economy data here. The smaller Cadillac CTS, for example, offers slightly better fuel economy if you’re willing to sacrifice some interior space.

Tips to maximize efficiency

Gentle acceleration is key to minimizing fuel consumption in the XTS. The 3.6L V6 has plenty of power, but using it carefully, particularly from a standstill, can make a noticeable difference. Avoid abrupt starts and stops, and try to maintain a steady speed whenever possible.

Proper tire inflation is another easy way to improve fuel economy. Check your tires regularly and make sure they are inflated to the recommended pressure, which is usually found on a sticker inside the driver’s side doorjamb or in the owner’s manual. Underinflated tires create more rolling resistance, which forces the engine to work harder and consume more fuel. Note: do not inflate over the maximum tire pressure written on the sidewall; follow the vehicle placard.

Avoid unnecessary idling. If you’re going to be stopped for more than a minute, turn off the engine. Modern cars are designed to restart quickly and efficiently, and idling consumes fuel without moving the car. This is particularly true with a larger engine like the 3.6L V6 in the XTS.

Reduce the amount of weight you carry in the car. Extra weight puts a strain on the engine and reduces fuel economy. Clean out unnecessary items from the trunk and back seat. A hundred pounds of extra stuff can negatively impact fuel consumption, especially in city driving.