The single biggest number on an electric car's spec sheet is also the most misunderstood. A range figure looks like a guarantee — drive this far, then recharge — but it is really the output of a controlled test under near-perfect conditions. Understanding how that number is produced is the difference between confidence and a roadside scramble for a charger.
Where the number comes from
Published range is measured on a laboratory dynamometer following a standardized drive cycle, with the climate control off, the battery at full health, and a gentle, repeatable speed profile. Those conditions rarely match a real commute. The figure is useful for comparing one car against another, because every model is tested the same way. It is far less useful as a literal prediction of how far you personally will go on a given morning. Think of it the way you treat a fuel-economy sticker on a petrol car: a reference point produced under ideal conditions, not a figure you will match in daily traffic. The gap between the two is not dishonesty; it is simply the difference between a laboratory and a life.
What quietly drains it
Real driving introduces variables the lab excludes. The most common range-eaters are predictable once you know to watch for them:
- Cold weather. Batteries deliver less energy when cold, and cabin heating pulls directly from the pack. A hard freeze can trim range noticeably.
- Highway speed. Aerodynamic drag rises sharply with speed, so steady motorway cruising is far thirstier than stop-start city driving — the opposite of a combustion car.
- Terrain and load. Long climbs, a full passenger count, and a roof box all take their cut.
- Battery age. Capacity fades gradually over years, so a used EV will not match its original sticker.
How to read it like a buyer
Treat the headline number as a ceiling, not an average. A practical rule is to plan around roughly 70 to 80 percent of the rated figure for mixed everyday use, and less in winter. If your daily driving is well inside that buffer, range anxiety simply evaporates — most people recharge at home overnight and never approach the limit. The number matters far more for the occasional long trip, where charging stops, not total range, define the journey.
The figure that actually matters
For most drivers, the more honest metric is efficiency — how much energy the car uses to travel a set distance. An efficient car with a modest battery can be cheaper to run and quicker to charge than a thirsty one with a huge pack chasing a big headline number. Efficiency also holds up better across seasons, because it reflects the car's fundamental design rather than a best-case test.
So when you compare models, look past the one bold figure. Ask how the car behaves at speed, how it manages cold, and how much energy it sips in normal use. For deeper comparisons, browse our EVs coverage, or see how these trade-offs shape purchases in our Buying guides. A range number is a starting point for a conversation, not the end of one — and the drivers who understand that are the ones who never think about range at all.