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ninalanyon · 61-69, T
It depends both on how cold it is and how long the journey is. If I drive multiple short trips at -15 C then the range can be cut by 30% or more because the battery never has time to warm to the optimum temperature. But if I drive at constant speed on the motorway for, say, 200 km then the reduction in range is much less because the battery is at optimum temperature for most of the way.