16 MPG combined won’t win any awards, but that’s not the point of the 2017 Mercedes-Benz AMG SL65. This is a hand-built weapon of excess, a rolling display of solving any problem with enough money and horsepower. Its staggering performance is more than just transportation; it transforms a trip to the grocery store into something special. Buyers considering an SL65 aren’t cross-shopping with Prius owners; they’re seeking a visceral experience, and they understand the considerable cost, both at the dealership and at the pump.

City and highway performance

Pin the throttle in the SL65 and you’re greeted with acceleration that rearranges internal organs. Those lucky (and wealthy) enough to experience that thrill will see roughly 13 MPG in city driving. The problem isn’t efficiency; it’s temptation. Every stoplight becomes a drag strip, every on-ramp an opportunity to unleash 738 pound-feet of torque. On the open road, the SL65 fares better, achieving an EPA-estimated 22 MPG. Even on the highway, maintaining a ‘reasonable’ speed requires considerable restraint. The V12 urges you to go faster, and resisting that urge is a daily challenge.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 Mercedes-Benz AMG SL65 at $3,600 per year. This figure is based on driving 15,000 miles annually and using national average fuel prices. That’s a substantial amount, certainly more than many people spend on their entire car payment. More aggressive driving, lower ambient temperatures, and different fuel types can impact this cost. Again, for someone who buys this car to experience the joy and visceral thrill of driving a hand-built V12, this figure is likely considered part of the overall ownership experience.

Real-world expectations

The EPA figures provide a useful benchmark, but real-world fuel economy can vary significantly based on driving style and conditions. Owners who frequently tap into the SL65’s power can expect to see numbers below the EPA estimates. Conversely, those who primarily use the car for long highway cruises, and who actively practice restraint, might achieve slightly better figures. Understanding the potential impact of driving habits is critical for managing fuel expenses and minimizing range anxiety. Consider the numbers above as a starting point, adjust based on your personal driving practices, and track your MPG over the long run to find your own baseline. You may also find the combined AMG MPG across all years on our site as well.

How it compares

The SL65’s fuel economy places it firmly at the bottom of the luxury roadster segment. A 2017 Porsche 911 Turbo S Cabriolet achieves around 21 MPG combined thanks to its smaller, turbocharged six-cylinder engine, which is similar in potency. Even a V8-powered Mercedes-Benz SL550 manages around 20 MPG combined. The all Mercedes Benz fuel economy data shows that across models, the SL65 is an outlier when compared to the rest of the lineup. Buyers who prioritize less gas will be better served by one of those alternatives, or other trims within the SL-Class range. But for those who demand maximum performance and are willing to sacrifice fuel economy, the SL65 remains in a class of its own.

Tips to maximize efficiency

Avoid aggressive acceleration. The SL65’s V12 is incredibly responsive, and it’s tempting to unleash its full potential at every opportunity. However, doing so will decimate your fuel economy. Gentle acceleration and smooth transitions can significantly improve fuel mileage, without entirely diminishing the car’s performance.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which in turn reduces fuel efficiency. Consult the sticker on the driver’s side doorjamb for the recommended tire pressure and check your tires regularly.

Use cruise control on the highway. Cruise control helps maintain a consistent speed, which can improve fuel economy on long highway drives. It also helps resist the urge to accelerate when the car feels like it is already gliding along thanks to the 6.0L V12.

Reduce unnecessary weight. Carrying excess weight in the trunk or passenger compartment can slightly impact fuel economy. Remove any unnecessary items to minimize weight.

Consider using premium fuel. While the SL65 may not explicitly require premium fuel, using it can help ensure optimal engine performance and fuel economy. The higher octane rating can prevent pre-ignition, which can reduce efficiency. Check the owner’s manual for the manufacturer’s recommendation.