21 MPG combined is acceptable but not outstanding for the 2023 Mercedes-Benz AMG C43 4matic Coupe. Nobody buys this car for fuel efficiency. This is a performance coupe, designed to thrill with its turbocharged six-cylinder engine and AMG-tuned chassis. The fuel economy figures are the price of admission.

City and highway performance

The EPA estimates for the C43 Coupe are 18 MPG in the city and 27 MPG on the highway. The city number reflects the engine’s quick response, encouraging frequent acceleration and spirited driving. Stop-and-go traffic reduces efficiency. On the open road, the 9-speed automatic transmission helps the engine settle into a relaxed cruising speed, enabling the C43 to achieve its best MPG. Highway driving also allows the engine to operate within its optimal efficiency range.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2023 Mercedes-Benz AMG C43 4matic Coupe is $2,750. This is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway, using national average fuel prices. This annual cost helps owners understand the true cost of owning this coupe. Fuel prices can vary significantly based on location and time, so actual fuel costs may differ.

Real-world expectations

EPA estimates provide a useful reference, but real-world fuel economy can vary depending on driving habits and conditions. Drivers with a heavier foot or those who spend more time in congested city environments will likely see lower MPG. Those who primarily drive on the highway and adopt a more conservative driving style may exceed the EPA’s estimates. The C43 encourages spirited driving, which can make achieving the EPA estimates a challenge.

How it compares

The C43’s fuel economy aligns with its direct competitors in the performance coupe segment. The BMW M440i xDrive Coupe, for example, achieves an EPA-estimated 25 MPG combined, giving it a slight edge. The Audi S5 Coupe lands around 24 MPG combined. These differences are unlikely to be a deciding factor for buyers. Performance and handling are usually prioritized over fuel efficiency. Those who consider AMG MPG across all years are performance-minded owners.

Tips to maximize efficiency

Use “Comfort” mode for everyday driving. This mode dials back throttle response and shift points, encouraging a relaxed driving style that can improve fuel economy. The “Sport” and “Sport+” modes should be reserved for occasions when you want to exploit the engine’s capabilities.

Pay attention to tire pressure. Maintaining the correct tire pressure, as indicated on the door jamb sticker, reduces rolling resistance and improves fuel efficiency. Check tire pressure regularly, especially during seasonal temperature changes. Be sure to check all Mercedes Benz fuel economy data for more insights.

Avoid hard acceleration and braking. Rapid acceleration and aggressive braking consume more fuel. Smooth and gradual driving conserves energy. Anticipate traffic flow and maintain a consistent speed.

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, turn the engine off. Newer vehicles often feature automatic start-stop systems that automatically shut off the engine at traffic lights and restart it when you lift your foot off the brake.

Consider using cruise control on the highway. Cruise control helps maintain a consistent speed, which can improve fuel economy on long highway drives. Be mindful of traffic conditions and adjust your speed to maintain a safe following distance.