23 MPG combined is hardly the defining attribute of the 2019 Mercedes-Benz AMG SLC43. It’s not a Prius; it’s a roadster designed for spirited driving and making a statement. The SLC43 caters to a very specific buyer, someone who prioritizes performance and open-air thrills over ultimate fuel efficiency. They likely have other vehicles for daily commuting or long hauls. This is a weekend toy, a stylish expression, and the MPG figure is a conceded practicality.

City and highway performance

The EPA estimates the 2019 AMG SLC43 will achieve 20 MPG in the city and 29 MPG on the highway. That city figure reflects the stop-and-go traffic, where the turbocharged 3.0L V6, even with its efficient direct injection, works harder to overcome inertia. However, the 29 MPG highway rating shows the benefits of the nine-speed automatic transmission. Its wider ratio spread allows the engine to cruise at lower RPMs, reducing fuel consumption on longer journeys. Drivers with a disciplined right foot may even exceed the EPA’s estimate, though the temptation to dip into the available power is ever-present.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2019 AMG SLC43 at $2,500. This figure is based on driving 15,000 miles per year, with a blend of city and highway driving that mirrors the EPA’s testing cycle. The calculation uses national average fuel prices. Of course, individual costs will vary widely depending on driving habits, local fuel prices, and the type of fuel used. Those who frequently engage the AMG’s performance capabilities can expect to exceed this estimate. On the other hand, drivers focused on optimizing fuel economy may fall below it.

Real-world expectations

While the EPA estimates provide a baseline, real-world MPG for the 2019 AMG SLC43 will vary considerably based on driving style. A light-footed driver predominantly on the highway might see numbers close to 30 MPG. However, someone frequently exploring the upper reaches of the tachometer on twisty backroads can expect significantly lower figures, possibly dipping below 20 MPG. The AMG’s character is a performance machine, and driving it as such will impact fuel consumption. The engine’s eagerness to rev and the exhaust’s addictive soundtrack incentivize spirited driving, making disciplined fuel-saving techniques a challenge.

How it compares

Compared to other performance roadsters, the 2019 AMG SLC43 occupies a middle ground. The Porsche 718 Boxster S, with its turbocharged 2.5L engine, delivers comparable performance with a slightly better EPA combined rating of 22 MPG (though real-world results are often similar). The BMW Z4 M40i, equipped with a turbocharged inline-six, offers significantly higher performance, but posts a nearly identical 25 MPG combined. Examining AMG MPG across all years shows that the SLC43 occupies a reasonable space in its category.

Ultimately, the choice comes down to specific performance preferences, brand loyalty, and styling preferences, as the fuel economy differences are relatively minor within this segment.

Tips to maximize efficiency

Although the AMG SLC43 isn’t designed for hypermiling, there are steps you can take to improve your fuel economy without sacrificing all the fun. Use the car’s driving modes strategically. Comfort mode dulls the throttle response and encourages earlier upshifts, which can make a noticeable difference in city driving. Sport and Sport+ modes significantly increase fuel consumption.

Avoid prolonged idling. Modern engines, including the AMG’s V6, are highly efficient and don’t require extended warm-up periods. If you’re stopped for more than a minute, turn off the engine. Idling consumes fuel without covering any distance, drastically reducing your MPG, especially when examined alongside all Mercedes Benz fuel economy data.

Maintain a consistent speed on the highway. Using cruise control helps prevent unintended acceleration and deceleration, which can significantly impact fuel consumption. This is especially important when navigating hilly terrain. Try to anticipate traffic conditions, avoiding sudden braking and acceleration. Smooth driving is efficient driving.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended levels. Also, consider using the factory-recommended premium gasoline. While not strictly required, premium fuel ensures optimal engine performance and may contribute to slightly better fuel economy. You’re already paying a premium for the car, so the marginal cost increase is worth considering.