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My electric car’s estimated range has dropped, but the change showed up during colder weather and I don’t know whether to treat it as normal seasonal variation or a sign the battery is losing capacity.
What comparisons are actually useful for judging electric vehicle range over time? Should I look at the car’s displayed estimate, energy use over a repeatable route, charging data, or a battery-health report? I’d also like to know how much a few cold weeks can distort the picture before I book a diagnostic check.
