Testing the effect on fuel efficiency while driving a Rivian R1T at reduced speeds: Decreasing speed from 65 to 60 MPH boosted fuel efficiency by 0.5 miles per kilowatt-hour.
In a recent test, driver Gregg Poss demonstrated that reducing speed by just 5 mph (from 65 mph to 60 mph) in his Rivian R1T resulted in a significant 23% improvement in efficiency[1]. This translated to about a 0.5 miles per kWh gain in range efficiency on a long, flat stretch of road in North Dakota.
The test, which was not the first time Gregg experimented with real-world EV efficiency, adds to practical insights on EV efficiency. It highlights how even small speed reductions can meaningfully increase the electric vehicle's driving range by reducing energy consumption.
Jon Gebarowski, another Rivian owner, calculated that a 5 MPH reduction in speed could provide an additional 70 miles of range with his battery size. This suggests that range is dynamic and influenced by driver behavior like speed choice.
However, not all drivers may be willing to slow down due to lifestyle constraints. Jennifer Haley expressed that she is unwilling to go slower due to her driving habits and time constraints. Yet, knowing options allows for smarter choices when necessary.
Another factor that can impact range is the vehicle's mode. Norm Buggel pointed out that driving in Conserve mode, which disables the rear motors in the quad-motor setup, could add an additional 8% range.
Consistent speed and terrain awareness can make long-term ownership of EVs surprisingly easy to manage. Range optimization involves learning to anticipate how terrain, load, and speed interact, making the driver an active participant in the EV experience.
Slower speeds can also reduce the overall risk in the event of a collision. A Rivian owner shared their 2022 R1T was totaled in a driver's side T-bone crash but walked away without injury.
Aram Krajekian, an automotive journalist, provides daily news coverage about cars on X and LinkedIn. He emphasizes the importance of understanding and adapting to the unique aspects of EV ownership, such as learning and paying attention to various factors to have more control over the experience.
In conclusion, Gregg's test suggests that range isn't just about battery size, but also about how one drives. By making small adjustments like reducing speed and utilizing efficient driving modes, EV owners can maximize their vehicle's range and enjoy a smoother, more efficient driving experience.
[1] Source: RIVIAN Electric Vehicles Discussion, Facebook group.
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