24 MPG combined isn’t going to win any hypermiling contests, but for the 2015 Cadillac ATS equipped with the 2.0L turbocharged four-cylinder, it’s a reasonable compromise between performance and efficiency. This isn’t a Prius competitor; it’s a Cadillac, designed for drivers who appreciate a sharp-handling, well-appointed compact sedan with a touch of American flair. Buyers in this segment typically prioritize a blend of sporty driving dynamics and a luxurious experience, and they’re willing to accept slightly below-average fuel economy to get it.

City and highway performance

The EPA estimates the 2015 Cadillac ATS 2.0L at 21 MPG in the city and 29 MPG on the highway. The city figure reflects the realities of stop-and-go traffic, where the turbocharger is constantly spooling up and down, impacting fuel consumption. The highway number is more respectable because the ATS settles into a comfortable cruise, using its six-speed automatic transmission to maintain relatively low engine speeds. The ATS is a relatively lightweight sedan for its class, which helps it get decent MPG numbers despite the turbocharger.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2015 Cadillac ATS 2.0L is $1,800. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this is just an estimate, and your actual fuel costs will vary based on your driving habits, the type of fuel you use, and fluctuations in gas prices. Drivers who primarily use the car for short commutes in heavy traffic will likely see fuel costs exceed $1,800, while those who do more highway driving might come in slightly below that figure.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy often differs. Drivers of the 2015 ATS 2.0L generally report figures close to the EPA estimates, although aggressive driving and frequent use of Sport mode can easily drop the combined MPG into the high teens. Conversely, careful drivers who anticipate traffic flow and maintain a steady speed on the highway can sometimes exceed the EPA’s 29 MPG rating. As always, your mileage will vary.

How it compares

In the compact luxury sedan segment, the 2015 Cadillac ATS 2.0L’s fuel economy sits roughly in the middle of the pack. The BMW 328i (2015) offered a similar driving experience and got an EPA-estimated 27 MPG combined, while the Audi A4 (2015) with its 2.0T engine achieved a slightly better 26 MPG combined. The Mercedes-Benz C300 (2015), another key competitor, landed close to the ATS at 25 MPG combined. Those seeking better fuel efficiency would likely consider the Lexus IS 300h hybrid at 42 MPG combined, although it offers a significantly different driving character. The ATS’s buyers are not typically looking at hybrid drivetrains however, prioritizing instead a responsive and engaging driving experience.

Tips to maximize efficiency

The 2.0L turbo rewards a light foot. Avoid sudden acceleration and hard braking, as these actions force the turbocharger to work harder, consuming more fuel. Instead, focus on smooth, gradual acceleration and anticipate traffic flow to maintain a consistent speed. The ATS has enough low-end torque that you can easily get up to speed without pushing it.

Use the ATS’s cruise control system on the highway. Maintaining a consistent speed not only reduces driver fatigue but also optimizes fuel efficiency. Set the cruise control to a reasonable speed and let the car manage the throttle to maintain optimal fuel consumption.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly, and inflate them to the recommended pressure listed on the sticker inside the driver’s side doorjamb.

Regular maintenance is critical for optimal fuel efficiency. Keep your engine properly tuned, change your air filter as recommended in the owner’s manual, and use the recommended grade of motor oil. A well-maintained engine runs more efficiently and consumes less fuel. You can find all Cadillac fuel economy data on our site, too.

Minimize idling. Letting your car idle for extended periods consumes fuel without covering any distance. If you’re going to be stopped for more than a minute or two, turn off the engine. You can also see ATS MPG across all years.