25 MPG combined isn’t going to win any awards, but for the 2020 Mercedes-Benz C300 Coupe, it’s an acceptable figure. This isn’t a car bought for maximum frugality; it’s a statement. It’s for the driver who values style and premium features over ultimate fuel efficiency. The C300 Coupe buyer is willing to trade a few MPG for the sleek look, the prestigious badge, and the engaging driving experience.

City and highway performance

The EPA estimates the C300 Coupe will achieve 22 MPG in city driving and 31 MPG on the highway. The city numbers reflect stop-and-go traffic where the 2.0L turbocharged engine works harder and its efficiency suffers. The highway figure is more representative of relaxed cruising where the 9-speed automatic can settle into its higher gears, letting the engine loaf and sip fuel more sparingly. These numbers are fairly typical for a small luxury coupe, but driving style will heavily influence the final results.

Annual fuel cost

The EPA estimates the C300 MPG across all years will result in an annual fuel cost of $2,300. This calculation is based on driving 15,000 miles per year, with roughly 55% of those miles driven in the city and 45% on the highway. It also assumes the current national average fuel price. Keep in mind that if you drive significantly more or less than 15,000 miles per year, or if fuel prices fluctuate, your actual fuel costs will vary. Premium fuel is recommended for the C300 Coupe to achieve its optimal performance and efficiency. The EPA calculation uses those prices, but filling with regular will negatively affect both.

Real-world expectations

The EPA figures offer a standardized benchmark. Your real-world fuel economy in the 2020 C300 Coupe will likely vary based on your driving habits and environment. Aggressive acceleration, frequent hard braking, and prolonged idling will all decrease fuel economy. Hilly terrain and cold weather can also negatively impact efficiency. A lead-footed driver in a congested city is unlikely to see 22 MPG. A careful driver on open highways might even exceed 31 MPG. Consider these EPA numbers a reasonable expectation if you adopt a moderate driving style.

How it compares

The BMW 430i Coupe, another popular choice in this segment, boasts an EPA-estimated 28 MPG combined, noticeably better than the C300. Some drivers prefer the Mercedes-Benz’s interior and styling over the BMW. The Audi A5 Coupe splits the difference, achieving around 27 MPG combined. Stepping outside the German brands, the Infiniti Q60 offers similar performance but typically comes in slightly lower on fuel economy, closer to 22 MPG combined and rewards drivers with added horsepower instead. The C300 Coupe’s fuel economy lands right in the middle of its competitive set. Buyers choose it for its blend of luxury, style, and driving dynamics. It’s not necessarily for its class-leading fuel efficiency.

Tips to maximize efficiency

Use the C300 Coupe’s selectable driving modes. The “Eco” mode optimizes the engine and transmission settings for maximum fuel efficiency by dulling throttle response and shifting to higher gears sooner. This is especially useful in stop-and-go city traffic.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly, especially during temperature changes, and inflate them to the recommended pressure listed on the doorjamb sticker.

Anticipate traffic flow and avoid hard acceleration and braking. Smooth, gradual inputs are key to maximizing fuel efficiency. Leave ample following distance to reduce the need for sudden stops.

Minimize idling time. If you’re stopped for more than a minute or two, turn off the engine. Modern cars, including the C300 Coupe, are designed to restart quickly and efficiently, and prolonged idling wastes fuel unnecessarily.

Keep your C300 Coupe properly maintained. Regular oil changes, air filter replacements, and spark plug maintenance ensure the engine is running at its peak efficiency and see all Mercedes Benz fuel economy data. Follow the manufacturer’s recommended maintenance schedule to keep your car in optimal condition.