27 MPG combined is far from the headline feature of the 2020 Cadillac CT4 2.0L turbo. This isn’t a Prius competitor, and Cadillac knew that when they engineered it. This fuel economy figure is acceptable for what the CT4 *is*: a compact, rear-wheel-drive biased sports sedan aimed at a buyer who values driving dynamics and premium features over outright efficiency.

City and highway performance

The EPA estimates that the 2.0L turbo CT4 manages 23 MPG in the city and 34 MPG on the highway. The city figure, while not class-leading, reflects the reality of stop-and-go traffic where the turbocharger comes in and out of boost. The highway number, however, is more impressive. Thanks to the eight-speed automatic transmission and relatively compact footprint, the CT4 can cruise efficiently at highway speeds. The tall gearing helps keep engine RPMs low, contributing to better fuel economy during long trips. The highway MPG is a better reason to buy for those who regularly commute.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Cadillac CT4 2.0L to be $2,150. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this number can change depending on your individual driving habits and the price of gasoline in your area. Drivers who spend more time in stop-and-go traffic, or those with a heavier foot, should expect a higher annual fuel cost. Likewise, drivers who primarily stick to the highway may see a lower cost. This figure also assumes you’re using regular unleaded gasoline, which is the recommended fuel for this engine. Switching to premium fuel will increase your expenses without providing noticeable performance benefits.

Real-world expectations

The EPA estimates provide a good baseline, but real-world fuel economy often varies. Aggressive driving, frequent acceleration, and heavy use of the air conditioning can all negatively impact your MPG. On the other hand, smooth acceleration, consistent speeds, and proper tire inflation can help you get closer to the EPA estimates, or even exceed them. Many drivers say that achieving the advertised 34 MPG on the highway is easily attainable when using cruise control and avoiding excessive speeding. If you spend your time on twisty back roads, maximizing what the CT4 is truly capable of, expect to see closer to 20 MPG overall.

How it compares

The CT4 exists in a competitive segment, and fuel economy is just one factor buyers consider. A BMW 330i, for instance, delivers a combined 28 MPG. The Mercedes-Benz C300 posts a combined 26 MPG. The Acura TLX varies wildly depending on trim and engine, but the base model with the 2.0L turbo and front-wheel drive achieves a combined 25 MPG. Buyers cross-shopping these vehicles are likely weighing fuel economy alongside performance, luxury, and brand cachet. The CT4’s direct competitor is most likely the BMW 330i. Its MPG figure of 27 is slightly behind the 330i’s 28 MPG, but ultimately the choice may come down to which car feels better to drive. See CT4 MPG across all years to consider older and newer versions.

Tips to maximize efficiency

Use cruise control whenever possible on the highway. Maintaining a constant speed minimizes unnecessary acceleration and braking, which can significantly improve fuel economy over long distances. The CT4’s adaptive cruise control system makes this even easier, as it can automatically adjust your speed to maintain a safe following distance from the vehicle ahead.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which requires the engine to work harder and consume more fuel. Check your tire pressure regularly, especially during temperature changes. The correct tire pressure can be found on a sticker located on the driver’s side doorjamb.

Avoid aggressive driving habits such as rapid acceleration and hard braking. These driving behaviors put extra strain on the engine and transmission, leading to increased fuel consumption. Smooth, gradual acceleration and anticipation of traffic conditions can help you save fuel and extend the life of your brakes.

Keep your vehicle properly maintained. Regular oil changes, air filter replacements, and tune-ups can help ensure that your engine is running efficiently. A neglected engine will often experience reduced fuel economy and performance. Following the recommended maintenance schedule in your owner’s manual is essential.

Minimize idling time. If you’re going to be stopped for more than a minute or two, turn off the engine. Idling consumes fuel without moving the vehicle, so it’s a waste of gas. Modern vehicles like the CT4 are designed to restart quickly and easily, so there’s no reason to let the engine run unnecessarily. Browse all Cadillac fuel economy data to compare against other models in the lineup.