85 MPG. That’s the combined EPA rating for the 2018 Tesla Model X P100D, a figure that sounds almost unbelievable for a seven-seat SUV capable of sprinting to 60 mph in under three seconds. Of course, it’s an electric vehicle, so those “MPG” numbers are actually MPGe, or miles per gallon equivalent, and the fact that something this large and brutally quick can achieve such high efficiency is part of its appeal.

City and highway performance

The EPA breaks down the Model X P100D’s efficiency even further, revealing an estimated 83 MPGe in the city and 89 MPGe on the highway. This difference, although small, highlights an important characteristic of electric vehicles: they often perform better in stop-and-go city driving than on the open road. This is due to regenerative braking, which captures energy during deceleration and sends it back to the battery, effectively recouping some of the energy that would otherwise be lost as heat. Highway driving, with its sustained speeds and minimal braking, offers fewer opportunities for regeneration, leading to slightly lower efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Tesla Model X P100D at a shockingly low $900. This figure is based on driving 15,000 miles per year and using the national average electricity prices. What’s critical to understand is that this cost can vary significantly depending on your location, electricity provider, and charging habits. Owners with access to off-peak charging rates, for instance, may pay even less, while those relying solely on public fast-charging stations could see their costs increase. Regardless, $900 per year is substantially lower than what you’d spend fueling a comparable performance SUV with a gasoline engine.

Real-world expectations

While the EPA provides a standardized baseline, real-world MPGe can change based on several factors. Driving style plays a big role; aggressive acceleration and high speeds drain the battery much faster. Weather conditions also affect efficiency, as cold temperatures can reduce battery performance, prompting some owners to see worse MPGe than the EPA numbers suggest. On the other hand, moderate temperatures generally yield optimal range and efficiency.

How it compares

Comparing the 2018 Tesla Model X P100D to other SUVs on fuel costs is an exercise in contrasts. Consider a gasoline-powered performance SUV like the BMW X5 M, it manages around 16 MPG combined. To get an equivalent amount of miles, that equates to a fuel bill about four times as much as the Tesla. Even a more fuel-conscious hybrid SUV like the Lexus RX 450h (31 MPG combined) can’t compete with the Model X P100D’s low running costs. Buyers considering the Model X P100D usually aren’t solely focused on fuel economy, given its high price and performance focus. However, the significant savings on “fuel” are a welcome bonus, especially for those who drive frequently or have long commutes.

Of course, you can also compare the Model X P100D to other Tesla vehicles. You can find more all Tesla fuel economy data on our site, or drill down on MODEL MPG across all years.

Tips to maximize efficiency

Take advantage of regenerative braking. The Model X offers different levels of regenerative braking, allowing you to customize the deceleration feel. Experiment to find the setting that suits your driving style, maximizing energy recovery and reducing the need for the friction brakes.

Precondition the battery. In cold weather, use the Tesla app to preheat the battery before driving. This warms the battery pack to its optimal operating temperature, improving efficiency and maximizing range.

Monitor your driving habits. Keep an eye on the energy consumption display in the Model X. It provides real-time feedback on your driving efficiency, allowing you to adjust your behavior and avoid unnecessary energy waste. Gentle acceleration and consistent speeds are key to maximizing range.

Plan your routes strategically. Use the Tesla navigation system, which incorporates charging locations along your route. This helps ensure you reach your destination without running out of battery, and allows you to schedule charge times around optimal rates when possible.