leafYou charge the car, see a reassuring range, then join a faster road and watch the estimate fall. That does not necessarily mean the battery suddenly lost capacity. Range is a forecast combining available energy with an assumption about how quickly you will use it. Change the assumption and the forecast changes.
The useful range equation
A simple estimate is available energy divided by consumption. With 20 kWh available and a consumption rate of 150 Wh/km, the arithmetic gives about 133 km. At 200 Wh/km, the same energy gives 100 km. These examples use the same battery and different driving demand.
That calculation does not establish that all stated energy is safely usable on the road. A practical journey plan also needs a reserve and allowance for changing conditions.
What Leaf Pro’s estimate does
The current app estimates range from its available-energy figure and average consumption. It uses the current drive’s consumption once enough distance has been recorded, and the previous drive’s figure before that. A change early in a journey can therefore reflect the input switching from yesterday’s driving to today’s.
The current implementation calculates toward estimated empty without holding back a reserve. Treat the result as a mathematical view, not a distance you should deliberately attempt. Plan your charging stops with your own margin, and follow the car’s low-charge warnings.
Why the dashboard and app can disagree
The car’s own range forecast and Leaf Pro’s estimate use different sources and assumptions. The app also exposes a controller SOC that can differ from the dashboard charge scale. Comparing two numbers is only meaningful after understanding which energy and consumption inputs they use.
A stale reading can create another apparent mismatch. Check the connection and timestamp context. A phone displaying an old value after a dropped adapter connection is not reporting a new state of the car.
Compare routes before comparing percentages
A short urban drive, a high-speed road journey and a cold trip with cabin heating are different energy demands. Traffic, elevation, weather, tyre condition and load can also change the result. A remembered summer range is not a controlled reference for a winter trip.
Use saved journeys to compare similar routes. Leaf Pro can group nearby start and end points, but inspect the route itself: similar endpoints do not guarantee the same road or traffic. Compare Wh/km, speed and temperature context before attributing the change to degradation.
Range loss and battery health are different questions
SOH addresses reported retained capacity. Consumption addresses how quickly energy is being used. Either can affect range, and both can change over time. A range forecast alone cannot tell you which one moved. Pair the health reading with your actual journey data to separate the questions.
Plan with room for uncertainty
- Use a recent, representative consumption figure.
- Allow for the conditions of the next trip, not just the last one.
- Keep a reserve for diversions and unavailable chargers.
- Check charging options before departure.
- Review unexpected real symptoms with a qualified specialist rather than relying on a range number alone.
The best use of an estimate is to make a better plan. It should not become a challenge to see whether the car will reach the last predicted kilometre.