How temperature and speed affect your EV's real-world range
An EV's rated range is measured under a specific set of conditions — and real-world driving rarely matches them. Temperature and speed are the two biggest levers, and a large Geotab fleet study quantified exactly how much each one moves the number.
The temperature effect
The headline figures
In optimal temperatures, true range runs about 15% better than the official rated range. On extremely cold days, range can drop by as much as 50% — the single largest swing either factor produces.
The speed effect — and why it depends on temperature
Speed matters too, but its impact isn't fixed — it interacts with temperature and vehicle type. On a 70°F day, driving a sedan at highway speed (70 mph) instead of city speed (30 mph) uses only about 13% more energy. The same comparison for a cargo van costs roughly 26% more range, since vans are far less aerodynamic.
| Vehicle type | Temperature | Most energy-efficient cruising speed |
|---|---|---|
| Sedan | 68°F (20°C) | ~19 mph |
| Sedan | 32°F (0°C) | ~37 mph |
| Cargo van | 68°F (20°C) | ~16 mph |
| Cargo van | 32°F (0°C) | ~25 mph |
Counterintuitively, the most efficient speed is actually higher in cold weather than in mild weather — because at low speeds, cabin heating and battery-conditioning overhead dominate energy use proportionally more than at higher speeds, where aerodynamic drag takes over as the main factor.
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