16 MPG combined. That’s the fuel economy figure for the 2023 Mercedes-Benz AMG SL63 4matic Plus, a car that prioritizes visceral thrills and high-performance driving over trips to the gas station. This isn’t transportation for those overly concerned with efficiency; it’s a statement, a two-door roadster engineered for apexes, not saving fuel. The target demographic isn’t looking to pinch pennies; they’re seeking an unmatched driving experience and some open-top theater. The sound and power of the hand-built AMG 4.0L V8 and the precision of the 4matic Plus all-wheel-drive system are the primary selling points, not miles per gallon.

City and highway performance

The EPA estimates the AMG SL63 will achieve 14 MPG in the city and 22 MPG on the highway. Those numbers reflect what to expect from a high-performance V8 engine. The stop-and-go nature of city driving means the engine spends a significant amount of time operating off its peak efficiency, resulting in lower MPG. While 22 MPG on the highway is respectable for an eight-cylinder engine producing this much power, it still falls far short of more efficient vehicles. This disparity is due to the engine’s design, optimized for power delivery across the RPM range, rather than fuel conservation. The nine-speed automatic transmission does its best to keep the engine in its most efficient range, but the performance-oriented gearing and power demands take precedence.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Mercedes-Benz AMG SL63 4matic Plus to be $3,600 per year. This is based on driving 15,000 miles per year and using national average fuel prices. Owners can expect to spend a considerable amount on fuel each year. This figure is a reminder that the pleasures of owning an AMG SL63 come at a literal price, one that extends beyond the impressive sticker.

Real-world expectations

The EPA estimates provide a baseline, but real-world fuel economy will vary depending on driving habits and conditions. Aggressive acceleration, frequent trips through the canyons, and extended idling will all decrease fuel efficiency. Sticking to steady highway speeds and avoiding sudden bursts of power will help to improve MPG, but it may compromise the fun. Expect to see numbers slightly below the EPA estimates if you drive it hard. Conversely, consistently gentle driving might yield slightly higher MPG, but that would arguably defeat the purpose. The best-case scenario still involves frequent trips to the gas station.

How it compares

The AMG SL63 isn’t alone in its segment, but its fuel economy sits firmly in the lower range. The Porsche 911 Carrera S, for example, is more efficient, achieving 20 MPG combined. The 911’s efficiency reduces trips to the pump and, to some degree, justifies its premium price tag. The BMW M8 Competition Convertible yields a similar result, achieving a slightly better 17 MPG combined. These differences matter to some buyers, but many are drawn more to personality and design. If fuel economy is an important concern, the hybrid Lexus LC 500h with its 29 MPG combined may be the best alternative. For those seeking another option within the Mercedes-Benz lineup, take a look at all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Gentle acceleration can have a surprising impact. The AMG SL63’s engine delivers strong power with even moderate throttle, so avoiding excessive acceleration can conserve fuel, particularly around town. It can be difficult to resist the urge to unleash the V8, but a smooth and steady approach to speed will deliver a noticeable improvement.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly and inflate them to the recommended levels found on the driver’s side door jamb. This simple step can improve fuel economy and extend the life of your tires.

Use cruise control on the highway whenever possible. Maintaining a constant speed minimizes unnecessary acceleration and deceleration, which will improve fuel efficiency. The AMG SL63’s cruise control systems can enhance this by automatically adjusting speed to maintain a safe following distance.

Reduce unnecessary weight. Carrying excess cargo in the trunk or backseat adds weight to the vehicle, which reduces fuel economy. Remove any unnecessary items to lighten the load and improve efficiency. A few extra pounds might not seem like much, but it can add up over time and reduce gas mileage.

Consider your drive mode. While the AMG SL63 offers various driving modes designed to optimize performance, selecting a more conservative mode, like “Comfort,” can soften throttle response and reduce fuel consumption in less demanding driving situations. Don’t forget to check out AMG MPG across all years.