Drivers usually arrive with 10–30% battery remaining and charge to 70–80% for optimal speed (DC fast charging slows significantly above ~80%).

This adds ~50–70% of a typical 60–100 kWh battery → 30–70 kWh possible, but real-world behavior favors quicker ~30-minute stops yielding 25–40 kWh.

Ultra-rapid chargers (150–350+ kW) deliver energy faster but don't substantially increase kWh per session — people still stop for similar time/distance needs.

Older data (pre-2023) often shows lower averages (~20–25 kWh) due to smaller batteries; current figures trend higher.

For context, 30–40 kWh typically adds 100–150 miles (160–240 km) of range in efficient EVs (~3–4 mi/kWh or 15–20 kWh/100 km). Home/AC charging sessions are often larger (full overnight charges), but public DC rapid/ultra-rapid use is optimized for speed over fullness.