With an EPA-estimated 89 MPGe combined, the 2015 Tesla Model S with the 90 kWh battery pack doesn’t chase gasoline mileage, it obliterates the very concept of gasoline entirely. This figure is a big change for drivers who prioritize performance, technology, and lower fuel costs over traditional measures of fuel efficiency. Owners aren’t cross-shopping this Model S against a Prius, they’re considering its acceleration, range, and charging infrastructure as a complete package.

City and highway performance

The impressive 89 MPGe breaks down into 88 MPGe in the city and 90 MPGe on the highway. These figures reveal a slight edge for highway driving, which isn’t always the case for electric vehicles. The Model S uses its aerodynamic design and regenerative braking system most effectively at higher, steadier speeds. Of course, the numbers are so similar that your actual real-world MPGe will come down to driving style far more than the difference between city and highway conditions. The instant torque delivery from the electric motor, along with the regenerative braking system, provides consistent and efficient performance in both environments.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Tesla Model S (90 kWh) at $850. This estimate is calculated based on 15,000 miles of driving per year and the national average electricity prices at the time of evaluation. Your actual electricity costs will vary depending on your location, charging habits, and electricity provider. For example, states with cheaper electricity rates will see a significantly lower annual cost, while those who predominantly use Superchargers could see that figure increase based on usage charges. Still, $850 represents a substantial amount of savings compared to a conventionally powered luxury vehicle of similar size and performance, savings that appeal directly to the target audience for this vehicle.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world MPGe will vary depending on driving style, weather conditions, and terrain. Aggressive acceleration, frequent use of climate control, and prolonged high-speed driving will all decrease efficiency. Colder temperatures can also significantly reduce battery range, impacting overall MPGe. However, careful driving habits, preconditioning the battery, and strategic use of regenerative braking can help drivers achieve or even exceed the EPA estimates. Remember to check out all Tesla fuel economy data to see how different models and years compare.

How it compares

Direct comparisons to gasoline-powered vehicles are almost irrelevant, but let’s consider alternatives within the electric luxury segment. A 2015 BMW i3 with the range extender achieves about 117 MPGe combined, it’s a remarkably efficient vehicle, but it offers considerably less range and performance than the Model S. The all-electric Mercedes-Benz B-Class Electric Drive (available in 2014 and 2015) gets around 84 MPGe combined; it is a similarly sized vehicle, but offered a vastly shorter range. For buyers considering these vehicles, these figures aren’t just numbers, they reflect distinct trade-offs between range, practicality, and performance. Someone prioritizing outright efficiency in a smaller package might consider the i3, while others value the Model S’s superior range, performance and spacious cabin. For MODEL MPG across all years, you can always use the search function.

Tips to maximize efficiency

Preconditioning the cabin while the vehicle is plugged in can significantly improve efficiency, especially in colder conditions. By warming or cooling the interior using grid power, you reduce the energy demand on the battery once you start driving, preserving your range and improving your MPGe. This simple habit can make a noticeable difference, particularly on shorter trips.

Optimize your driving style for efficiency. Avoid aggressive acceleration and braking, and maintain a consistent speed whenever possible. The Model S’s regenerative braking system is highly effective, capturing kinetic energy during deceleration and converting it back into electricity to recharge the battery. Anticipating traffic and using regenerative braking strategically can significantly improve your MPGe.

Pay attention to tire pressure. Properly inflated tires reduce rolling resistance, improving overall efficiency. Check your tire pressure regularly and maintain it at the recommended level specified on the doorjamb sticker. Even a slight difference in tire pressure can impact fuel economy.

Reduce aerodynamic drag by removing unnecessary items from the roof or cargo area. Roof racks, bike carriers, and other accessories can increase wind resistance, reducing efficiency, especially at higher speeds. When not in use, remove these items to improve aerodynamics.