18 MPG combined. No one considering a 2018 Mercedes-Benz AMG GT Roadster is losing sleep over fuel economy. This isn’t a Prius competitor; it’s a snarling, handcrafted performance machine designed to deliver blistering acceleration and a soundtrack that would make Wagner proud. The fuel consumption number is merely a byproduct of that mission, a tax one willingly pays for the privilege of experiencing V8 fury in a top-down, two-seat rocket.

City and highway performance

The EPA estimates for the AMG GT Roadster put the city figure at 16 MPG and the highway at 21 MPG. These aren’t numbers to brag about, but they’re also not entirely unexpected for a vehicle packing a hand-built 4.0L V8. The nature of stop-and-go city driving, with its constant acceleration and braking, inevitably takes a toll on fuel efficiency. On the open highway, the AMG GT Roadster fares slightly better, but the temptation to unleash its power often negates any potential gains in fuel economy. The driver is more likely to be dipping into the vast reserves of torque for effortless passing maneuvers than hypermiling for an extra mile per gallon.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Mercedes-Benz AMG GT Roadster is estimated to be $3,200. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is just an estimate, and your actual fuel costs may vary depending on your driving habits, the type of fuel you use, and fluctuations in fuel prices. However, it provides a useful benchmark for comparing the fuel costs of different vehicles. Consider this: that $3,200 could fund a nice weekend getaway or a high-performance driving course to hone your skills behind the wheel of this beast.

Real-world expectations

While the EPA estimates offer a guideline, real-world fuel economy will vary considerably depending on driving style. Those who frequently exploit the AMG GT Roadster’s acceleration capabilities will undoubtedly see numbers lower than the EPA estimates. Drivers who adopt a more restrained approach and spend more time on the highway might achieve slightly better fuel economy.

Achieving, or exceeding, the 21 MPG highway rating will require a significant degree of self-control that few AMG GT Roadster owners are likely to possess because the car is simply too tempting to drive gently.

How it compares

Compared to its competitors, the AMG GT Roadster’s fuel economy falls into a predictable range. A Porsche 911 Carrera Cabriolet, for example, returns around 20 MPG combined, depending on the specific configuration and engine. A Jaguar F-Type R Convertible, with its supercharged V8, is similarly thirsty, hovering around the 18 MPG mark. The Audi R8 Spyder manages slightly better figures, closer to 19 MPG combined.

These differences are unlikely to sway a buyer in this segment. The deciding factors are more likely to be styling, performance characteristics, brand preference, and the overall driving experience. You can also review AMG MPG across all years on our site, if you want to explore other options.

Tips to maximize efficiency

While the AMG GT Roadster isn’t designed for fuel efficiency, you can take some steps to minimize your fuel consumption. Avoid aggressive acceleration and braking whenever possible.

The AMG GT Roadster’s V8 thrives on power, so use it judiciously. Smooth, consistent throttle application will help you extract the most mileage from each gallon of premium fuel.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which can negatively impact fuel economy. Check your tire pressures regularly and inflate them to the manufacturer’s recommended levels. This is especially important on a performance car where maintaining optimal handling and grip is crucial.

Reduce unnecessary weight by removing any excess cargo from the car, as added weight increases fuel consumption. Leaving golf clubs, workout gear, or extra luggage in the trunk adds up over time and impacts fuel economy, however slightly. The AMG GT Roadster is about performance first; keeping it light helps.

Consider using the car’s driving modes strategically. Selecting a comfort or efficiency-focused driving mode will typically alter the engine mapping and transmission behavior to prioritize fuel economy. These modes may tame the exhaust note and throttle response, but they can help save fuel during less spirited driving situations. You can review all Mercedes Benz fuel economy data on our site if you want to view other Mercedes models.

Service the car according to the manufacturer’s recommendations. Regular maintenance, including oil changes, air filter replacements, and spark plug replacements, can help ensure that your AMG GT Roadster is running at peak efficiency. A well-maintained engine is a more efficient engine.