18 MPG combined isn’t going to win any green awards, but for the 2018 Cadillac XTS AWD with its 3.6L V6, it’s a figure that many owners find perfectly acceptable. This isn’t a car chasing hypermiling records; it’s a large, comfortable, and traditionally styled luxury sedan aimed at a specific clientele who prioritize space, ride quality, and familiar features over cutting-edge fuel efficiency. This is a vehicle for long cruises and relaxed travel, not stoplight sprints.

City and highway performance

The EPA estimates that the 2018 Cadillac XTS returns 16 MPG in the city and 23 MPG on the highway. The city figure reflects the realities of stop-and-go traffic and the inherent inefficiencies of a larger vehicle navigating urban environments. The V6 engine, while smooth and capable, needs to work harder in these conditions, impacting fuel consumption. The highway rating of 23 MPG is more respectable, hinting at the XTS’s strength as a comfortable, long-distance cruiser. The six-speed automatic transmission plays its part here, helping to optimize engine speed for steady highway travel, but it lags behind more modern 8- 10-speed units in absolute efficiency.

Annual fuel cost

The EPA calculates the estimated annual fuel cost for the 2018 Cadillac XTS AWD at $3,200. This figure is based on driving 15,000 miles per year, using a national average fuel price. Your actual fuel costs will vary depending on your driving habits, the type of driving you do, and local fuel prices. Someone who primarily drives short distances in the city will likely exceed this amount, while drivers who mostly stick to the highway may find they spend less. The EPA arrives at this number by combining the city and highway MPG ratings and applying them to the 15,000-mile annual distance. For owners who are particularly fuel-conscious, monitoring your own fuel consumption can provide a more accurate picture of your running costs.

Real-world expectations

While EPA estimates provide a standardized benchmark, real-world MPG can vary significantly. XTS owners often report figures that are close to the EPA estimates for mostly highway driving. However, aggressive acceleration, frequent short trips, and prolonged idling can all negatively affect fuel economy. The all-wheel-drive system, while providing enhanced traction in adverse conditions, also adds weight and slightly increases drivetrain friction, contributing to a small decrease in overall MPG compared to a front-wheel drive model. Monitoring your own driving habits and adapting them to prioritize fuel efficiency can make a noticeable difference.

How it compares

Compared to its competitors, the 2018 Cadillac XTS AWD lands somewhere in the middle of the pack. The Lexus ES 350, for example, achieves a combined 26 MPG, significantly better than the XTS. Similarly, the Acura TLX with the V6 engine manages around 24 MPG combined, offering a noticeable improvement in fuel efficiency. On the other hand, the Lincoln Continental, with its optional 3.0L twin-turbo V6 and all-wheel drive, delivers around 19 MPG combined, which is similar to the XTS. For the XTS buyer, fuel economy is rarely the primary decision point. These buyers tend to value classic Cadillac attributes that are often missing in its more efficient competitors. For those seeking all Cadillac fuel economy data, the options are available to improve one’s knowledge.

Tips to maximize efficiency

Avoid aggressive acceleration. Gentle and gradual acceleration allows the engine to operate more efficiently. The XTS’s smooth V6 doesn’t need to be pushed hard to deliver adequate performance, so take it easy on the throttle and ease into your desired speed. Embrace the XTS’s core mission of relaxed cruising.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Check your tire pressure regularly and inflate them to the recommended levels indicated on the tire placard, typically found on the driver’s side doorjamb. Even a few PSI difference can impact fuel consumption.

Minimize idling. Letting the engine idle for extended periods consumes fuel without covering any distance. If you’re stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine. This is particularly relevant in city driving, where traffic lights and congestion can lead to prolonged idling.

Use cruise control on the highway. Maintaining a consistent speed on the highway helps to optimize fuel economy. Cruise control minimizes fluctuations in speed, preventing unnecessary acceleration and deceleration. This can be particularly beneficial on long road trips, where maintaining a steady pace can significantly improve MPG. If looking for XTS MPG across all years, do the research.