The 2017 Mercedes-Benz C300 4matic, a compact luxury sedan, gets 27 MPG combined. It prioritizes comfort and technology, rather than being the most fuel-efficient car. It’s for drivers who appreciate a refined driving experience, a stylish interior, and the added security of all-wheel drive, while still seeking reasonable efficiency. It’s a calculated compromise, and one many C300 buyers are perfectly willing to make.

City and highway performance

The EPA estimates the C300 4matic achieves 24 MPG in the city and 31 MPG on the highway. The city figure reflects the demands of stop-and-go traffic, where the 2.0L turbocharged four-cylinder works harder to accelerate the C300’s weight. The highway number demonstrates the engine’s efficiency at a constant speed, aided by the smooth-shifting 7-speed automatic transmission. These numbers provide a good baseline for comparison, but as with any vehicle, individual results will vary based on driving style and conditions.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Mercedes-Benz C300 4matic at exactly $2,150. This figure is based on driving 15,000 miles per year and using the then-current national average fuel price. Note that fuel prices fluctuate, and your personal mileage may differ. Therefore, consider this a standardized estimate for comparing fuel costs across different vehicles. If you drive significantly more or less than 15,000 miles annually, your actual fuel expenses will be different than what the EPA data suggests.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy can vary. C300 drivers who spend most of their time in congested urban environments might see figures closer to, or even slightly below, the 24 MPG city estimate. On the other hand, those who primarily drive on highways with minimal traffic may achieve slightly better than the 31 MPG highway figure. Aggressive driving habits, such as rapid acceleration and hard braking, will negatively impact fuel economy, while a smooth, consistent driving style will yield better results. Examining C300 MPG across all years reveals trends in reported real-world performance, and can help owners understand what to realistically expect.

How it compares

Compared to its competitors, the 2017 C300 4matic lands in the middle of the pack in terms of fuel economy. The BMW 320i xDrive, for example, offers a similar driving experience with an EPA-estimated 28 MPG combined. The Audi A4 2.0T quattro manages 27 MPG combined, matching the C300. The Lexus IS 200t AWD offers around 24 MPG combined. These differences can add up over time. The C300 buyer prioritizes the Mercedes-Benz badge, interior luxury, and available technology features, often accepting slightly lower fuel economy as a trade-off. For buyers concerned with the best MPG in this segment, the BMW 330e plug-in hybrid (rated at 72 MPGe combined) presents a more efficient, albeit more expensive, alternative.

Tips to maximize efficiency

The 2.0L turbocharged engine in the C300 4matic responds well to smooth acceleration. Avoid sudden bursts of speed and try to maintain a consistent throttle position. Hard acceleration uses extra fuel, especially when the turbocharger is engaged.

Ensure your tires are properly inflated to the recommended pressure listed on the driver’s side door jamb. Under-inflated tires increase rolling resistance, which forces the engine to work harder and therefore consume more fuel. Checking your tire pressure regularly, ideally every other week, makes a meaningful difference, especially over time.

The C300’s 7-speed automatic transmission is programmed to select higher gears quickly for optimal fuel economy. Take advantage of this by anticipating traffic flow and avoiding unnecessary braking. Coasting to red lights is a great way to conserve momentum and minimize fuel consumption.

Reduce unnecessary weight in the vehicle. Carrying extra cargo, such as golf clubs or sporting equipment, adds to the vehicle’s load and reduces fuel efficiency. Clear out any items you don’t need on a regular basis for a small but noticeable improvement. Don’t keep items you don’t need in the trunk, your fuel ecomomy will suffer.

Consider using the vehicle’s “ECO” driving mode if it’s equipped. This mode adjusts the throttle response and transmission mapping to prioritize fuel efficiency. While it might slightly reduce performance, it can contribute to noticeable fuel savings, especially during city driving. Explore all Mercedes Benz fuel economy data to see how different models and driving modes compare.