25 MPG combined from the 2017 Cadillac CT6 2.0L isn’t going to win any hypermiling contests, but it’s a respectable number for a large luxury sedan. Buyers of the CT6 2.0L aren’t necessarily prioritizing ultimate fuel efficiency; they’re drawn to the Cadillac’s blend of spaciousness, style, and technology, all at a slightly more accessible price point than its V6 or V8-powered siblings. This engine allows entry into the CT6 club without the higher fuel bills associated with larger displacement engines, appealing to the accounting department without sacrificing too much luxury.

City and highway performance

The EPA estimates for the CT6 2.0L are 22 MPG in the city and 30 MPG on the highway. The city figure reflects the realities of stop-and-go traffic, where the smaller engine works harder to move the CT6’s considerable mass. However, the highway number is more appealing thanks to the 8-speed automatic transmission, which allows the engine to cruise at lower RPMs for improved fuel economy. These figures suggest that road trips are manageable, and the CT6 2.0L won’t completely drain your wallet at the pump. While the transmission offers eight gears, its programming favors smoothness over aggressive downshifts for maximum economy, so plan your overtaking maneuvers accordingly.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Cadillac CT6 2.0L at $2,300. This figure is based on driving 15,000 miles per year and using national average fuel prices. While individual fuel costs will vary based on driving habits and local fuel prices, this provides a benchmark for comparing the CT6 2.0L to other vehicles. Premium fuel is recommended for optimal performance, which may increase your actual expense.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy can change. Factors like driving style, traffic conditions, and even tire pressure can significantly impact your MPG. Aggressive acceleration and frequent hard braking will drastically reduce fuel economy, while consistent highway driving at moderate speeds will likely bring you closer to or even slightly above the EPA’s 30 MPG estimate. Regular maintenance, including timely oil changes and properly inflated tires, also plays a critical role in maintaining optimal fuel efficiency.

How it compares

In the large luxury sedan segment, the CT6 2.0L’s fuel economy is competitive. Consider the BMW 530i, which achieves a similar 27 MPG combined. The Mercedes-Benz E300 also gets around 25 MPG. Choosing the larger V6 or V8 engines in these competitors will inevitably lead to lower fuel economy. For example, the CT6’s own 3.6L V6 achieves around 22 MPG combined. These comparisons are important for the CT6 2.0L buyer because they are likely cross-shopping these brands and may be willing to compromise on outright performance for better fuel efficiency. You can find all Cadillac fuel economy data on our site, including CT6 MPG across all years.

Tips to maximize efficiency

Use the CT6’s driving modes. The “Tour” mode prioritizes fuel efficiency by optimizing throttle response and shift points. Experiment with this mode, particularly on longer highway drives, to see how it impacts your fuel consumption.

Avoid unnecessary idling. Modern engines are designed to be restarted without significant fuel penalty. If you anticipate being stopped for more than a minute, turning off the engine can save fuel, particularly in city driving. The CT6 does not have an auto stop/start function, making this tip more impactful.

Maintain a steady speed on the highway. Using cruise control can help prevent sudden acceleration and deceleration, which waste fuel. Anticipate traffic flow and adjust your speed gradually to minimize unnecessary braking and acceleration.

Ensure 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 driver’s side door jamb or in your owner’s manual.

Lighten the load. Carrying unnecessary weight in your trunk or backseat reduces fuel economy. Remove any items you don’t need to improve your MPG. Keeping your vehicle clean inside and out improves airflow too.