$18.03full charge
The Kona Electric SE (65 kWh) costs about $18.03 to charge fully at District of Columbia's average home rate of 25.21¢/kWh, including ~10% charging loss (71.5 kWh from the wall). That is $9.01 per 100 miles.
EIA residential average, District of Columbia, 2026-07 (latest in this book). No District of Columbia gasoline series, so this uses PADD 1B regular, week of Oct 5, 2026.
At 1,000 miles a month and 30 mpg, home charging costs $90.13 and the gas car costs $145.43. The EV saves $55.31 a month at $4.363/gal. Both miles and mpg are editable on the calculator.
The listed DC fast-charge time to 80% is 45 minutes at up to 75 kW. A full home charge is a different session. This page prices the energy from the wall, not how long a Level 2 charger takes.
This page uses the residential rate. Public fast-charging prices are a separate scenario and are not included.