31 MPG combined might seem underwhelming in the world of electric vehicles, but it’s a crucial lifeline for the 2020 BMW i3s with Range Extender. This isn’t just about chasing maximum MPGe; it’s about mitigating range anxiety for a specific type of buyer who values the i3s’ unique blend of futuristic design, city-friendly dimensions, and BMW driving dynamics, but needs a backup plan for occasional longer trips.

City and highway performance

The EPA numbers reveal a consistent efficiency across driving environments: 30 MPG in the city and 31 MPG on the highway. While these figures might not set any records, they indicate the i3s’ optimized electric powertrain with the range extender acting as a supplemental energy source. The i3s shines in urban settings where its nimble handling and instant torque make it fun to drive. The range extender helps eliminate any concerns about finding charging stations while running errands or navigating stop-and-go traffic. On the highway, the range extender allows for confident cruising, though it’s supplementing rather than replacing gasoline power. The consistency in MPG shows it is well tuned for both conditions, as opposed to some range extenders which work better under certain driving styles.

Annual fuel cost

The EPA estimates an annual fuel cost of $1,850 for the 2020 BMW i3s with Range Extender. This calculation is based on driving 15,000 miles per year and using the national average fuel prices at the time of testing. It provides a benchmark for potential owners to compare the i3s’ running costs with those of a traditional gasoline-powered vehicle or even a pure EV, factoring in the cost of electricity versus gasoline in their specific location. The $1,850 figure is an estimate and your personal fuel expenses will vary based on your driving habits, local fuel prices, and the proportion of your driving powered by the gasoline range extender versus electric charging.

Real-world expectations

The posted 31 MPG combined figure needs to be viewed alongside the car’s electric range. The i3s with Range Extender is primarily an electric vehicle, so daily commutes within the car’s electric range will result in minimal gasoline consumption. However, extended trips that exceed the electric range will rely heavily on the 0.6L 2-cylinder engine, potentially leading to fuel economy figures that are lower than the EPA estimates if you find yourself constantly relying on the gasoline engine. Conversely, disciplined charging habits and shorter journeys can result in significantly lower fuel costs than the EPA estimate. Ultimately, the real-world fuel economy strongly depends on the driver’s lifestyle and willingness to maximize the electric component of the powertrain as much as possible.

How it compares

Compared to other plug-in hybrids like the Toyota Prius Prime (54 MPG combined) or the Hyundai Ioniq Plug-In Hybrid (52 MPG combined), the 2020 i3s with Range Extender lags behind purely on MPG numbers. However, these competitors offer a completely different driving experience. The Prius and Ioniq prioritize fuel efficiency, and the i3s offers a sportier, more engaging drive with a unique design aesthetic. Even compared to other EVs, like the Chevrolet Bolt (120 MPGe combined), the i3s with Range Extender uses considerably more “fuel” overall, but this is the price paid for the added flexibility of the range extender. For those who are worried about pure EV range anxiety, but still want an EV experience, comparing I3S MPG across all years alongside other EVs shows this model offered a unique solution. If maximizing MPG is the sole priority, other options exist, but for those prioritizing design, driving dynamics, and the safety net of a gasoline engine, the i3s with Range Extender occupies a niche of its own.

Tips to maximize efficiency

Prioritize charging whenever possible. The more you rely on the electric motor, the less the range extender kicks in, which will improve overall fuel efficiency and minimize trips to the gas station. Develop a consistent charging routine, plugging in at home overnight or using public charging stations during the day, to keep the battery topped off and ready for action.

Drive with a light foot. Aggressive acceleration and hard braking consume more energy, whether it’s from the electric motor or the gasoline engine. Smooth and gradual inputs will help maximize the efficiency of both power sources. Using the “Eco Pro” driving mode, if equipped, can also help by optimizing various vehicle systems for increased efficiency, at the expense of some performance.

Plan your routes strategically. Before embarking on a longer journey, assess the availability of charging stations along the way. By incorporating charging stops into your itinerary, you can minimize the reliance on the range extender and maintain a higher electric driving ratio. Navigation systems within the i3s can often help you find stations and estimate range based on your route.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which forces the engine and motor to work harder. Regularly check your tire pressure and inflate them to the recommended levels to improve fuel efficiency and extend the life of your tires. All of this all Bmw fuel economy data suggests this is the #1 thing you can do to increase MPG.