How we tested.
The same EV can have wildly different range figures depending on which testing standard was used. Understanding the difference between EPA and WLTP testing helps you set realistic expectations for the vehicle you are considering.
What Is the EPA Rating?
The EPA sets the US standard. Tests on a dynamometer through standardized city and highway cycles. After raw results, a 30% reduction is applied for real-world variables: temperature extremes, aggressive driving, accessory use. This correction factor is the primary reason EPA numbers are lower.
What Is the WLTP Rating?
Used in Europe and many other markets. Four speed phases: low, medium, high, extra-high. More dynamic than the old NEDC but still produces higher numbers because it does not apply the same aggressive correction factor.
Why They Differ
The EPA's 30% correction is the biggest driver. The EPA highway cycle includes higher sustained speeds. Climate control effects are weighted more heavily by EPA. WLTP tire optimization can favor testing.
Which Is More Accurate?
Neither is perfect, but EPA generally comes closer for North American driving patterns. Higher highway speeds and heavy climate control use align with the EPA's conservative approach. WLTP users often find real-world range 10-20% short.
Real-World Factors
Speed (80 mph vs 60 mph can cut 25%+ range), temperature (20F can lose 30-40%), terrain, payload, tire pressure, and HVAC use all affect actual range.
Practical Rule of Thumb
Expect 85-90% of EPA in mild weather. In cold winter: 60-70% of EPA. For WLTP, reduce by an additional 10-15%. Your car's trip computer becomes the best estimator after a few weeks of driving.