19 MPG combined won’t win any awards, but it’s what you get with the 2016 Mercedes-Benz SL550. This isn’t a car for those trying to save gas; it’s a grand touring roadster, a statement of performance and luxury. Buyers choosing the SL550 want power and comfort more than good mileage. They appreciate the sound of the V8 and the open top, not worrying about getting gas.

City and highway performance

The SL550’s EPA estimates are 16 MPG in the city and 24 MPG on the highway. The city number reflects stop-and-go driving where the 4.7L V8 uses fuel. The highway number is better, achievable when cruising at a steady speed, helped by the smooth seven-speed automatic transmission. However, using the engine’s power for passing will reduce that highway MPG. Drivers who frequently use the V8’s full potential will see fuel economy closer to the city number.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 Mercedes-Benz SL550 at $3,050. This is based on driving 15,000 miles per year and using national average fuel prices. This is just an estimate; driving habits and local fuel costs can change the actual amount spent on gasoline. For example, a driver who mainly drives in the city and accelerates quickly will likely spend more, while someone who takes long highway trips and drives conservatively may spend less. The EPA calculation provides a benchmark for comparing the SL550’s fuel costs to other vehicles.

Real-world expectations

EPA estimates are a guide, but real-world fuel economy can vary. Factors like driving style, traffic, and tire pressure can affect fuel consumption. Drivers who often use the SL550’s Sport or Manual modes, holding gears longer, will see lower MPG. Short trips where the engine doesn’t reach operating temperature will also hurt fuel economy. Owners should expect a range, with lower MPG from aggressive driving and higher MPG from careful driving on the open road.

How it compares

The 2016 SL550’s fuel economy is normal for high-performance roadsters. The BMW Z4 sDrive35i, with its turbocharged inline-six, gets a slightly better 20 MPG combined. A Porsche 911 Carrera Cabriolet, with better handling and similar performance, gets around 22 MPG combined, due to its more modern engine. One of the SL550’s direct competitors is the Jaguar F-Type R Convertible, which gets around 18 MPG combined with its supercharged V8. For those concerned with fuel efficiency, all Mercedes Benz fuel economy data is available, including SL550 MPG across all years. Buyers in this market accept that performance costs money, and fuel economy is often not their top concern.

Tips to maximize efficiency

Even though the SL550 isn’t made to save gas, you can still improve its efficiency. Maintaining proper tire inflation, as shown on the door, reduces rolling resistance and improves fuel economy. Checking tire pressure can make a difference.

Avoid quick acceleration and hard braking. The SL550’s engine responds well, but gentle acceleration uses less fuel. Watch traffic and maintain a steady speed to reduce fuel use.

Use the “Comfort” driving mode for everyday driving. This setting configures the engine and transmission for fuel efficiency, using smooth acceleration. It may not be as fun as “Sport” mode, but it can save gas.

Avoid idling. If you’re stopped for more than a minute, turn off the engine. Modern engines restart quickly, and idling wastes fuel.

Keep up with maintenance. A well-maintained engine runs better. Follow the service schedule, including oil changes and air filter replacements, for best fuel economy.