$13.59full charge
The i5 eDrive40 (84 kWh) costs about $13.59 to charge fully at Washington's average home rate of 14.71¢/kWh, including ~10% charging loss (92.4 kWh from the wall). That is $4.38 per 100 miles.
EIA residential average, Washington, 2026-07 (latest in this book). EIA weekly retail regular, Washington, week of Oct 5, 2026.
At 1,000 miles a month and 30 mpg, home charging costs $43.85 and the gas car costs $180.80. The EV saves $136.95 a month at $5.424/gal. Both miles and mpg are editable on the calculator.
The listed DC fast-charge time to 80% is 31 minutes at up to 205 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.