An electric car’s real-world range depends on temperature, cabin heating or cooling, speed, driving style, route elevation and vehicle load. Cold weather can have a particularly large effect, but no single percentage applies to every EV. You can help preserve range by preconditioning while plugged in when supported, using targeted comfort features, keeping tires at the vehicle’s specified pressure, moderating speed where safe and practical, and planning a buffer for demanding conditions.
What affects an electric car’s real-world range?
Temperature and cabin climate control
Cold affects battery performance and increases the energy needed to heat the cabin. In very hot weather, air conditioning and battery thermal management also use energy. The size of the effect depends on the vehicle, the conditions and how its climate systems operate.
AAA’s 2026 controlled test used three EVs on a chassis dynamometer at 20°F, 75°F and 95°F, with the HVAC set to 72°F. In those tested vehicles and conditions, calculated driving range was 39.0% lower at 20°F than at 75°F, and 8.5% lower at 95°F than at 75°F. These are test-specific results, not forecasts for every EV or trip. AAA’s 2026 test details.
Heating is a major winter load. A U.S. Department of Energy (DOE) program-record comparison found that a heat pump reduced total HVAC system power draw by 38% at 20°F in the analyzed vehicle comparison. That is a reduction in HVAC power draw—not a 38% increase in driving range. Heat pumps generally use less power than resistance heating in ordinary cold conditions, but become less effective in extreme cold; some vehicles use a combination of systems. DOE’s 2024 program record.
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Speed, acceleration and braking
At higher speeds, aerodynamic drag makes the car use more energy to move. Rapid acceleration also demands more energy than gradual acceleration. City driving can offer more chances to recover energy through regenerative braking, while highway driving typically uses more energy to overcome drag. The balance for a particular trip depends on its speed, traffic and route. DOE Alternative Fuels Data Center guidance on EV range.
Elevation, route and load
Climbing hills requires energy, and carrying heavy loads can reduce range. Heating or cooling demand adds another variable, so the same car may cover different distances on trips of the same length. DOE advises allowing extra range for hills, heavy loads and extensive HVAC use. DOE Alternative Fuels Data Center guidance on charging and trip planning.
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How large are the published range changes?
Percentages from different studies should not be averaged or treated as interchangeable: studies may use different vehicles, temperatures, HVAC settings, drive cycles and measures. For example, AAA’s 2026 test reported both calculated range and MPGe, which are distinct outcomes. Its three EVs had a 35.6% decrease in EV MPGe at 20°F versus 75°F; that is an efficiency result, not a range figure. AAA’s 2026 results.
| Source and test | Reported finding | What it means |
|---|---|---|
| AAA, 2026; three EVs tested at 20°F, 75°F and 95°F with HVAC set to 72°F | Calculated range was 39.0% lower at 20°F and 8.5% lower at 95°F, each versus 75°F | Calculated-range results for that test’s vehicles and procedure |
| DOE summary, 2020; controlled laboratory testing | All-electric vehicle fuel economy can be nearly 40% lower in cold temperatures | A fuel-economy summary; actual results vary, and it is not the same measure or test as AAA’s 2026 calculated-range finding |
| AAA, 2019; five EVs in a controlled study | Average driving range was 41% lower at 20°F with HVAC heating on, and 17% lower at 95°F with air conditioning on | An older study with a different vehicle group and protocol from AAA’s 2026 test |
Sources: AAA, 2026; DOE, 2020; AAA, 2019. When comparing figures, check the temperature, HVAC setting, vehicles tested, drive cycle and whether the result is range, efficiency or energy use.
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How can you improve or protect your usable range?
Before setting off
- Precondition while plugged in, if your vehicle supports it. Warming the cabin and, where available, the battery before departure can shift some initial heating demand to the charging connection. Follow the vehicle maker’s controls and guidance. DOE charging guidance.
- Choose sheltered parking in cold weather. Park indoors or under cover when possible. DOE charging guidance.
- Check tire pressure. Inflate tires to the pressure specified for your vehicle. A digital tire pressure gauge can help you check it; no universal range gain is established for this step. AAA’s recommendations.
While driving
- Use comfort features strategically. Seat or steering-wheel heating can provide targeted warmth where available, rather than relying only on heating the entire cabin. AAA recommends targeted comfort features. AAA’s recommendations.
- Moderate sustained high speeds when safe and practical. This is especially useful in extreme temperatures, when range is already under pressure. AAA’s recommendations.
- Accelerate smoothly and account for the route. Avoiding rapid acceleration can reduce energy demand; allow for climbs, heavy cargo and substantial heating or cooling. DOE range guidance; DOE trip-planning guidance.
Plan charging around conditions
Base charging plans on the actual trip and conditions, not just the vehicle’s rated range. DOE notes that charging to a higher state of charge may be appropriate for longer trips or extreme cold; the amount needed depends on distance and circumstances. Leave extra margin for cold weather, hills, heavy loads or high HVAC demand. DOE charging and trip-planning guidance.
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