kWh/100 mi
The US efficiency figure for electric cars: energy consumed per 100 miles, shown on the EPA label. Lower is better.
kWh/100 mi is how the US expresses electric car efficiency: the kilowatt-hours of energy consumed to drive 100 miles, as measured on the EPA cycle and printed on the window sticker. As with all consumption-per-distance figures, a smaller number is the more efficient car.
Its usefulness is cost math in a country that thinks in miles. Take the figure, multiply by your electricity price per kWh, and you have the energy cost of 100 miles of driving, the same calculation CarPairly's total cost of ownership estimates use.
Because a mile is 1.609344 km, the same car's kWh/100 mi figure is numerically larger than its kWh/100 km figure. CarPairly derives both from the stored Wh/km value for the relevant test cycle, using fixed formulas, so the two figures for one cycle never disagree. The EPA and WLTP cycles are different tests, so never mix figures across cycles.
Differs by market
Used in the US market, based on EPA testing. Metric markets use kWh/100 km and the UK uses mi/kWh. From the stored EPA Wh/km value: multiply by 1.609344, then divide by 10.