$37.40full charge
The Gravity Grand Touring (123 kWh) costs about $37.40 to charge fully at New Hampshire's average home rate of 27.64¢/kWh, including about 10% charging loss (135.3 kWh from the wall). That is $8.31 per 100 miles.
EIA residential average, New Hampshire, 2026-08 (latest in this book). No New Hampshire gasoline series, so this uses PADD 1A regular, week of Oct 19, 2026.
At 1,000 miles a month and 30 mpg, home charging costs $83.10 and the gas car costs $141.63. The EV saves $58.53 a month at $4.249/gal. Both miles and mpg are editable on the calculator.
The listed DC fast-charge time is 10–80% in 19 min (estimate) at up to 400 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.