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What does a 300 km range rating tell you?
It tells you how a vehicle performed under a defined test and helps you compare cars measured on the same basis. It does not, by itself, predict the distance for your route. To make a useful estimate, you need to know the car’s exact version, the rating system, and whether your driving is mixed, mostly motorway, or in cold weather.
Rating systems use different test methods
In the United States, the Environmental Protection Agency (EPA) tests vehicles on laboratory dynamometers. Its official explanation says, “All testing is done in a laboratory on a dynamometer.” The EPA adjusts cycle results for factors including cold temperatures, air conditioning and high-speed or aggressive driving, then calculates the combined label value by weighting adjusted city results 55% and adjusted highway results 45%. Optional calculation approaches are allowed, so the precise path can vary. EPA: Fuel Economy and EV Range Testing
Do not apply the EPA’s calculation to a European WLTP figure. WLTP and EPA are different rating bases; a number labeled 300 km is only meaningful when you know which one it uses.
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How much can motorway driving change the result?
ADAC’s 2025 winter motorway test offers a useful illustration of how a demanding, specific journey can differ from a rating. The Cupra Born was listed with a 594 km WLTP range, but managed 325 km in the test. ADAC selected cars rated for at least 500 km WLTP and simulated the Munich–Berlin A9 route in a laboratory at 0 °C. The route included gradients and traffic patterns; maximum speed was 130 km/h and average speed was 111 km/h. ADAC: Winter range test for electric cars, 2025
That result is not a conversion factor for every electric car. The test did not measure vehicles rated at exactly 300 km, and results depend on the particular model and conditions. It does show why a standardized figure should not be treated as a guaranteed motorway journey distance.
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Why does cold weather affect range differently by trip?
Short trips after a cold start
ADAC reports Green NCAP measurements from 2022–2023 in which average range was about 40% lower at -7 °C than at 23 °C. This comparison came from a specific short WLTC cycle with a cold-soaked vehicle and repeated heating. The reduction is not a general estimate for every winter drive or a prediction for a long motorway trip. Differences between the vehicles tested were substantial. ADAC: Electric-car range in winter
Winter motorway journeys
Cold short-trip results and motorway test results describe different conditions, so they should not be combined into one universal “winter penalty.” In ADAC’s 2026 winter motorway test at 0 °C, no tested car completed the roughly 580 km route without stopping. The Audi A6 Avant e-tron Performance covered 441 km before stopping. That test also selected cars with at least 500 km WLTP range, so it demonstrates a particular long-distance winter outcome—not the real-world range of every car rated at 300 km. ADAC: Winter motorway test for electric cars, 2026
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How to judge a 300 km car for your own driving
ADAC’s mixed-profile Ecotest publishes model-specific range results intended for like-for-like comparisons. For example, its database lists 290 km for a Hyundai Inster and 295 km for a Cupra Born e-Boost. These are test outputs for those specific variants and that test, not a general conversion from a 300 km rating. ADAC notes that higher speeds and lower temperatures reduce range. ADAC: Car tests and Ecotest results
When comparing a vehicle with a 300 km rating, check:
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- Rating basis: Is the figure EPA, WLTP, or another rating? Compare vehicles using the same system where possible.
- Exact version: Check model year, battery and drive version, and wheels where those details are available; range can differ by variant.
- Driving profile: Look for a mixed-cycle result if most of your use is varied, and a motorway test if you regularly drive at sustained high speeds.
- Temperature and start conditions: A moderate-temperature journey, repeated short trips from cold starts, and a winter motorway run are distinct scenarios.
- Long-trip charging: Consider driving range separately from how much range the car can add during a charging stop. Charging capability affects journey planning, not the distance available from a single charge.
For context, ADAC’s 2026 winter assessment weights measured range at 50%, test consumption at 25%, and range added in 20 minutes at 25% when evaluating long-distance suitability. That weighting describes ADAC’s assessment method, not a universal way to rank cars. ADAC: Winter motorway test for electric cars, 2026
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