25 MPG combined isn’t cause for celebration in the economy car segment but, in a stylish, German-engineered two-door coupe, it’s an acceptable trade-off. The 2018 Mercedes-Benz C300 Coupe isn’t bought for its thrifty gas mileage; it’s purchased for its design, badge prestige, and engaging driving dynamics. Fuel efficiency is less important for the buyer who wants a sleek profile and premium interior.

City and highway performance

The C300 Coupe’s 2.0L turbocharged four-cylinder engine delivers power smoothly thanks to its well-matched 9-speed automatic transmission. The EPA estimates 22 MPG in the city and 30 MPG on the highway. City driving, with its constant stop-and-go, will lower the overall fuel economy. The highway figure reflects the benefits of the transmission’s tall top gears, which allow for relaxed cruising. Consistent highway miles should allow for the claimed 30 MPG or even slightly better, depending on how you drive.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2018 Mercedes-Benz C300 Coupe is $2,300. This figure is based on driving 15,000 miles per year and using national average fuel prices. Remember that premium fuel is recommended for optimal performance in the C300, which will affect this annual cost. Fuel prices change, and driving habits play a role, so this is a guideline for budgeting.

Real-world expectations

The EPA provides a standardized benchmark, but real-world fuel economy can vary a lot. Drivers who often drive in the C300’s sporty driving modes or spend time accelerating hard will likely find their MPG lower than the 25 MPG combined rating. However, those who prioritize smooth acceleration, anticipate traffic, and consistently use cruise control on the highway will likely see numbers closer to or exceeding those stated by the EPA. Keeping the car properly maintained, by following all scheduled maintenance recommendations, helps keep the engine and transmission operating efficiently.

How it compares

The C300 Coupe competes with other luxury coupes that balance style with some efficiency. For example, the 2018 BMW 430i Coupe with its 2.0L turbo-four is rated at 28 MPG combined, a noticeable edge. The Audi A5 Coupe from the same model year yields a similar 27 MPG combined. These differences can add up over time. Browsing all Mercedes Benz fuel economy data helps contextualize the C300 MPG across their lineup. Buyers may also want to compare C300 MPG across all years to see how design and engineering changes have impacted fuel mileage.

Tips to maximize efficiency

Use the C300’s driving modes. “Comfort” mode softens throttle response and encourages earlier upshifts, saving fuel during city driving. Save Sport or Sport+ driving modes for when driving enjoyment is the focus.

Make sure the tires are inflated to the recommended pressure. Underinflated tires create more rolling resistance, forcing the engine to work harder and burn more fuel. This is important because the C300 often has larger, sportier wheels that lose pressure easier.

Remove unnecessary weight in the vehicle. Carrying extra cargo in the trunk adds weight, impacting fuel economy. Remove any items that aren’t essential.

Anticipate traffic flow and maintain a consistent speed. Avoid sudden acceleration and hard braking, as these waste fuel. Look ahead and adjust your speed gradually to maintain momentum, helping to conserve fuel with the 9-speed automatic transmission.