With 113 MPG combined, the 2021 BMW i3s is highly efficient. It’s designed for efficient urban travel, not for hauling cargo or long trips. The i3s is a specialized tool for city drivers who prioritize maximizing efficiency and minimizing their impact on the environment. Its quirky looks and limited range are deliberate design choices reflecting this specific mission.

City and highway performance

The EPA numbers show the i3s’s true strength is city driving. Its 124 MPG city rating proves where this electric hatchback shines. Regenerative braking is incredibly effective in stop-and-go situations, recovering much of the energy normally lost during deceleration. The 102 MPG highway figure, while still impressive, highlights the i3s’s relative weakness. At higher speeds, aerodynamic drag becomes more significant, and the electric motor works harder to maintain momentum, diminishing its efficiency. The i3s isn’t really designed to be a long-distance highway cruiser, it’s optimized to excel in the city.

Annual fuel cost

The EPA estimates an annual fuel cost of just $650 for the 2021 BMW i3s. This calculation is based on driving 15,000 miles per year using a predetermined percentage of city versus highway miles, and using the national average electricity price. Your actual cost will vary based on your local electricity rates, driving habits, and how much you drive. However, compared to gasoline-powered vehicles, the potential savings are substantial. For a buyer considering all Bmw fuel economy data, it can be an eye opener compared to the rest of the current lineup.

Real-world expectations

While the EPA provides a standardized measurement, real-world MPG for the i3s is highly dependent on driving style and environmental conditions. Aggressive acceleration and frequent use of climate control can noticeably reduce efficiency. However, gentle driving with careful application of regenerative braking can exceed the EPA estimates. Temperature also plays a role; colder temperatures reduce battery performance and range. Owners who consistently charge at home during off-peak hours will experience the lowest operating costs.

How it compares

Few cars can match the i3s’s electric efficiency. The Hyundai Kona Electric, for example, achieves 120 combined MPGe, making it a strong competitor, but still slightly less efficient. The Nissan LEAF boasts 111 combined MPGe. While these alternatives offer similar electric performance, they cater to a slightly different buyer. The i3s appeals to those who prioritize a premium driving experience and unique design, even if it means a slightly higher price tag. If you compare I3S MPG across all years, the 2021 model is nearly identical to prior model years.

Tips to maximize efficiency

Precondition the cabin while the i3s is still plugged in. This draws power from the grid rather than the battery, preserving your range, especially in cold weather, and is particularly applicable for those cold winter mornings.

Maximize regenerative braking. Anticipate traffic flow and lift off the accelerator early to allow the i3s to decelerate, using the electric motor as a generator. The i3s offers a strong regenerative braking mode, so use it.

Drive smoothly and avoid sudden acceleration or hard braking. Gradual transitions in speed are more efficient than jerky movements. Imagine driving with a full cup of water on the dash.

Monitor tire pressure regularly. Underinflated tires increase rolling resistance and reduce efficiency. Maintain the recommended tire pressure for optimal performance.

Reduce unnecessary weight. Remove any extra items from the car to reduce the load on the electric motor and extend your range. Less weight means more range.