19 MPG combined. That’s what drivers of the 2017 Mercedes-Benz AMG SL63 get, a figure that might make fuel-conscious drivers think twice. This car isn’t for those seeking Prius-like economy. It’s the cost to experience handcrafted performance, explosive acceleration, and the intoxicating roar of a hand-built AMG 5.5L V8 engine.

City and highway performance

The EPA estimates the AMG SL63 achieves 16 MPG in the city and 25 MPG on the highway. These figures reflect the car’s character. Stop-and-go city driving forces the powerful V8 to work harder, quickly reducing fuel economy. On the open highway, with the transmission in a higher gear and the engine running at lower RPMs, the SL63 shows a more respectable return, but still not as good as its more economical siblings. Few SL63 owners spend much time worrying about efficiency during their daily commute, but they may see a slightly better highway number during weekend trips if they’re careful not to constantly engage the turbos.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Mercedes-Benz AMG SL63 at $3,050. This figure is based on driving 15,000 miles per year and using average national fuel prices. Real-world fuel costs can vary greatly based on individual driving habits, location, and changing fuel prices. However, this gives a standard way to compare the SL63’s fuel consumption to other vehicles. For many AMG SL63 owners, this cost is just part of the overall ownership experience and is a relatively small price to pay for the enjoyment the car provides.

Real-world expectations

While the EPA provides a standard test, real-world MPG often differs, sometimes a lot. Aggressive acceleration, frequent hard braking, and long idling times will all hurt fuel economy, possibly dropping the observed MPG below the EPA estimates. But a driver who actively drives gently and spends more time on the highway might see numbers closer to, or even slightly better than, the EPA’s figures. Because of the SL63’s performance and the driving style it encourages, expecting large improvements over the EPA estimates is unlikely. The sound and feel of the AMG-tuned engine and exhaust are too tempting.

How it compares

The 2017 AMG SL63’s fuel economy gives a clear comparison to its competitors. The BMW M6 Convertible, with its 4.4L V8, also gets around 17 MPG combined, according to EPA estimates. The Porsche 911 Turbo S Cabriolet offers similar performance, but gets slightly better fuel economy thanks to its smaller, more efficient engine; the EPA estimates around 20 MPG combined. These differences, though small, can add up and might be a factor for some buyers. You can also review all Mercedes Benz fuel economy data if you are considering other Mercedes models.

Tips to maximize efficiency

Because of the AMG SL63’s high-performance character, getting better MPG takes effort and a change in driving habits. Avoid quick acceleration and hard braking, as these cause the engine to use more fuel. Accelerating gradually and watching traffic flow will help use less gas.

Proper tire inflation is a simple way to improve fuel economy. Underinflated tires increase rolling resistance, making the engine work harder. Check your tire pressure regularly and make sure it’s at the manufacturer’s recommended level, found on the sticker inside the driver’s side door jamb.

Don’t let the engine idle unnecessarily. Idling uses fuel without going anywhere. If you’re stopped for more than a minute, it’s usually better to turn off the engine and restart it when you’re ready to go. The AMG SL63, like many modern vehicles, has advanced engine management that makes restarting efficient.

Plan your trips well. Combining multiple errands into one trip can reduce the total distance and cold starts, which use a lot of fuel. Route planning that avoids congested areas and allows steady driving can also improve MPG.

Try using a lighter touch on the accelerator during highway cruising. The SL63’s power can tempt drivers to maintain higher speeds, but easing up a little can greatly improve fuel efficiency, especially on longer drives. Always obey posted speed limits. You can see how AMG MPG across all years compares, to understand how economy has changed over time.