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Last updated: September 18, 2026 Quick Take Per U.S. Department of Energy data, an EV's electric drive loses only 15-20% of its energy, versus 64-75% for a gasoline engine. Energy reaching the wheels is 60-66% in city driving and 71-73% on the highway, and counting regenerative braking the city figure climbs past 94%. The rest leaks out through charging, drivetrain, aerodynamic drag, rolling resistance and accessories.   What decides EV energy efficiency is not battery size but where the energy leaks out. DOE data puts electric drive-system losses at just 15-20%, energy-to-wheels efficiency at 60-66% in the city and 71-73% on the highway, and above 94% in the city once regenerative braking is counted. Plenty of EV drivers notice that the same car returns worse efficiency at 70 mph on the interstate than in stop-and-go traffic. This explainer follows the energy-flow breakdown published on fueleconomy.gov, the site run by the U.S. Department of Energy (DOE) and the EPA, to show w...

Last updated: September 9, 2026 Quick Take: Weaker regenerative braking does not automatically mean something is broken. An EV may temporarily reduce regeneration when the battery is nearly full, its temperature is outside the preferred range, or a drive mode or assistance feature changes how deceleration is managed. Check the instrument panel and owner’s manual, and use the brake pedal whenever more stopping force is needed. Regenerative braking can make an electric vehicle feel remarkably consistent—until the car suddenly coasts farther than expected. The change may be normal, but drivers should understand why it happens because the amount of deceleration available from regeneration is not guaranteed to remain constant. What regenerative braking actually does During regenerative braking, the drive motor acts as a generator. It slows the vehicle while converting some of its kinetic energy into electricity that can be returned to the high-voltage battery. Friction brakes sl...