$11.95full charge
The i4 eDrive40 (81 kWh) costs about $11.95 to charge fully at North Dakota's average home rate of 13.41¢/kWh, including ~10% charging loss (89.1 kWh from the wall). That is $3.59 per 100 miles.
EIA residential average, North Dakota, 2026-07 (latest in this book). No North Dakota gasoline series, so this uses PADD 2 regular, week of Oct 5, 2026.
At 1,000 miles a month and 30 mpg, home charging costs $35.88 and the gas car costs $136.97. The EV saves $101.09 a month at $4.109/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.