The 2018 Audi S5 3.0L 6-cyl gets 24 MPG combined. While this isn’t the best fuel economy in its class, it’s a reasonable trade-off for a stylish, potent, and genuinely fun grand tourer coupe or Sportback. This car prioritizes performance and design while still offering reasonable efficiency.

City and highway performance

The EPA estimates for the 2018 Audi S5 are 21 MPG in the city and 30 MPG on the highway. This difference reflects the car’s driving characteristics. In urban environments, the S5’s turbocharged V6 and eight-speed automatic transmission use more fuel in stop-and-go traffic. However, on the open road, the S5 cruises efficiently, using its tall gearing and efficient engine management to deliver impressive highway mileage. The gap between city and highway figures is significant. Drivers who primarily commute in congested areas should expect closer to 21 MPG, while those with longer highway commutes will likely see numbers closer to 30 MPG. This is a realistic outcome depending on driving conditions.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,400 for the 2018 Audi S5 3.0L 6-cyl. This estimate is based on driving 15,000 miles per year and assumes national average fuel prices, so gas prices will directly impact this number. Driving habits also play a crucial role. Aggressive acceleration, frequent hard braking, and consistent speeding will increase fuel consumption and yearly fuel expenses above the $2,400 estimate. Conversely, following speed limits and driving smoothly can help lower those costs. Audi recommends premium fuel for the S5, which is generally more expensive than regular unleaded and will increase the annual fuel cost.

Real-world expectations

The EPA provides a standardized baseline, but real-world fuel economy for the 2018 Audi S5 will vary from driver to driver. While many owners report numbers close to the EPA estimates, individual results depend on driving style, traffic, and terrain. Drivers who prioritize performance and enjoy the S5’s acceleration likely will see fuel economy below the EPA’s estimates. Those who drive more conservatively and prioritize fuel conservation can realistically achieve, or exceed, the EPA’s highway MPG figure.

How it compares

The 2018 Audi S5 competes with other vehicles in its class. The BMW 440i Gran Coupe, a similarly styled fastback, achieves an EPA-estimated 25 MPG combined, slightly better than the S5. The Mercedes-AMG C43 Coupe, another strong German competitor, gets around 22 MPG combined. These differences, while small, can add up over time. People choose the S5 over these vehicles for more than just fuel economy. It balances performance, luxury, and design. Fuel economy is a factor, but not the only one. Compare S5 MPG across all years for more information. Many buyers will cross-shop these models, making their decision after driving each and considering their priorities.

Tips to maximize efficiency

The S5 offers various driving modes, including an “Efficiency” mode that optimizes the engine and transmission for fuel economy. Using the Audi Drive Select system to select this mode alters throttle response and shift patterns, prioritizing efficiency over outright performance. This is a simple way to save fuel during everyday commuting.

Pay attention to tire pressure, as underinflated tires increase rolling resistance and impact fuel economy. Regularly check and maintain the recommended tire pressure, found on a sticker inside the driver’s side doorjamb. This simple maintenance can improve MPG and extend tire life.

Avoid excessive idling. Modern engines are efficient even at startup. Idling wastes fuel and emits pollutants. If you’re stopped for more than a minute, it’s more efficient to turn off the engine. The S5 does not have a start/stop system, but the principle is the same.

Minimize aerodynamic drag by removing unnecessary items from the roof or cargo area, which can increase drag and negatively impact fuel economy, especially at highway speeds. Make sure roof racks are installed properly to minimize wind resistance.

Drive smoothly and consistently. Avoid aggressive acceleration and hard braking, as these behaviors consume more fuel. Anticipate traffic flow and maintain a steady speed whenever possible. Consistent driving is especially important considering the turbocharged nature of the S5’s engine. Light throttle inputs result in the best fuel economy compared to using higher RPMs and heavier acceleration.