20 MPG combined won’t win any fuel economy contests, but it’s the price of entry for the 2016 Cadillac XTS AWD with the 3.6L V6. This isn’t a car chasing efficiency; it’s a large, comfortable, and decidedly American luxury sedan designed for smooth cruising and effortless power. The XTS buyer prioritizes space, a plush ride, and the availability of all-wheel drive, accepting the fuel consumption as a trade-off for those attributes. They are likely more concerned with a quiet cabin and massaging seats than squeezing every last mile out of a gallon.

City and highway performance

The EPA estimates of 17 MPG in the city and 26 MPG on the highway reflect the reality that the XTS is happiest on the open road. Its weight and the need to overcome inertia in stop-and-go traffic take a toll on fuel consumption around town. On the highway, however, the 3.6L V6 settles into a relaxed cruise, making the most of its gearing and cylinder deactivation technology. The six-speed automatic, while perhaps feeling a bit dated compared to the eight and ten-speed transmissions found in some competitors, is smooth and predictable, aiding in consistent highway mileage when you’re not aggressively accelerating.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 Cadillac XTS AWD with the 3.6L V6 at $2,200. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using national average fuel prices at the time of calculation. Keep in mind that your actual fuel costs will vary depending on your driving habits, the type of roads you frequent, and the prevailing fuel prices in your area. Aggressive driving will further diminish MPG, increasing this annual expense.

Real-world expectations

While the EPA provides a standardized estimate, real-world driving conditions often lead to different results. XTS owners may see figures slightly below the EPA’s 17 MPG city rating, especially in areas with heavy congestion. On long highway trips, achieving 26 MPG is certainly attainable if you maintain a steady speed and avoid excessive acceleration. Many drivers average between 18 and 23 MPG in mixed driving, which is a realistic expectation. Check XTS MPG across all years to see owner-submitted fuel economy.

How it compares

When considering alternatives, understanding how the XTS stacks up is important. The Lexus ES 350, a similarly sized luxury sedan, easily achieves a combined MPG of 26. However, it isn’t available with AWD. Opting for a Chrysler 300S AWD nets approximately 21 MPG combined, presenting a slight improvement though also generally perceived as less luxurious inside. Even other Cadillac options, like the smaller CTS with the base 2.0T engine, offer better fuel economy at 25 MPG combined while sacrificing interior space and features. The XTS is about size, comfort, and available all-wheel drive in a classic Cadillac package.

Tips to maximize efficiency

Although the XTS isn’t designed to be a fuel sipper, there are still ways to improve its MPG. Gentle acceleration is key. The 3.6L V6 provides ample power, but rapid acceleration burns unnecessary fuel. Smoothly increase your speed, anticipating traffic flow to avoid sudden bursts of power.

Minimize idling time. Letting the engine run while waiting will quickly reduce your MPG. If you anticipate being stationary for more than a minute, turn the engine off. Restarting the engine consumes less fuel than prolonged idling, especially with modern fuel injection systems.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended level, which can be found on the sticker inside the driver’s side doorjamb.

Reduce unnecessary weight. Carrying extra cargo in the trunk reduces fuel efficiency. Remove any items you don’t need to lighten the load. Similarly, avoid using a roof rack unless absolutely necessary, as it increases aerodynamic drag.

Service it on time. Regular maintenance can have a large effect on fuel economy. New air filters, spark plugs, and clean engine oil can restore lost MPGs. Be sure to consult all Cadillac fuel economy data. The XTS responds well to consistent care and attention.