$20.21full charge
The EQS SUV 550 4MATIC (118 kWh) costs about $20.21 to charge fully at Montana's average home rate of 15.57¢/kWh, including about 10% charging loss (129.8 kWh from the wall). That is $6.38 per 100 miles.
EIA residential average, Montana, 2026-08 (latest in this book). No Montana gasoline series, so this uses PADD 4 regular, week of Oct 19, 2026.
At 1,000 miles a month and 30 mpg, home charging costs $63.75 and the gas car costs $148.93. The EV saves $85.18 a month at $4.468/gal. Both miles and mpg are editable on the calculator.
The listed DC fast-charge time is 10–80% in 31 min at up to 200 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.