The 2015 Cadillac ATS AWD with the 3.6L V6 achieves 21 MPG combined. While this isn’t class-leading, and won’t tempt hybrid owners, it’s an acceptable trade-off for confident all-weather handling, a refined driving experience, and the appeal of a Cadillac. This is a statement car with sporting intentions, not a fuel-efficient commuter.

City and highway performance

The EPA estimates the 2015 Cadillac ATS AWD 3.6L at 18 MPG in the city and 26 MPG on the highway. This difference highlights the powertrain’s characteristics. The 3.6L V6 and six-speed automatic transmission work harder in stop-and-go traffic, reducing efficiency. On the open road, where the engine cruises more easily, MPG approaches an acceptable level for the car’s weight and power.

The AWD system adds weight and friction, which contributes to the lower city MPG. Drivers primarily in urban areas will likely see closer to 18 MPG. Those who frequently drive on the highway might get closer to 26 MPG. See ATS MPG across all years.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,100 for the 2015 Cadillac ATS AWD 3.6L. This is based on 15,000 miles per year and national average fuel prices. Your actual fuel costs will depend on your driving habits, fuel type (premium is recommended), and local gas prices.

Aggressive acceleration, hard braking, and idling will negatively affect fuel economy, raising your annual costs above the EPA’s estimate. More conservative driving and consistent highway driving could lower expenses.

Real-world expectations

Real-world MPG for the 2015 Cadillac ATS AWD 3.6L varies. Owners report a wide range. Some struggle to reach the EPA’s combined rating, while others exceed the 26 MPG highway estimate. Driving style, tire inflation, vehicle maintenance, and gasoline grade all matter.

Expect fluctuations, especially in colder months when winter-blend gasoline is used and engine warm-up times are longer. This car values power and responsive handling over pure efficiency. Don’t expect it to sip fuel.

How it compares

The 2015 Cadillac ATS AWD 3.6L competes in a strong segment. The BMW 328i xDrive achieves a slightly better 26 MPG combined, despite similar performance. The Audi A4 2.0T quattro manages 25 MPG combined. The Lexus IS 350 AWD gets 22 MPG combined, slightly better than the ATS.

These small differences matter to buyers who prioritize fuel economy in the luxury sport sedan category. Anyone considering all Cadillac fuel economy data accepts a MPG compromise for the Cadillac brand’s benefits.

Tips to maximize efficiency

Smooth, gradual acceleration helps the 2015 Cadillac ATS AWD 3.6L. Avoid flooring the gas pedal. Instead, maintain a steady speed and anticipate traffic to reduce harsh acceleration or braking. On the highway, use cruise control to maintain consistent speed and optimize fuel efficiency.

Regular maintenance is critical for optimizing fuel economy. Keep tires properly inflated to the recommended pressure, found on the driver’s side doorjamb. Ensure the engine air filter is clean to help your engine breathe easily. Regular oil changes are important, too.

Minimize idling. If stopped for more than a minute, turn off the engine. Modern engines restart quickly, and the fuel saved adds up. Avoid carrying unnecessary weight in your car, as this reduces fuel economy.

Consider using the ATS’s driver-selectable modes. “Tour” mode prioritizes fuel efficiency. “Sport” mode emphasizes performance. For normal driving, stay in “Tour” mode unless you want a more spirited experience. Note how these modes affect throttle response and shift points.