Cost per mile
Gas$0.150/mi$15.05 per 100 mi · $4.213/gal
EV, home charging$0.038/mi$3.82 per 100 mi · $0.1337/kWh
Yearly gap, home charging$1,347at 12,000 miles a year
EIA doesn’t publish a weekly price for Idaho, so this uses the Rocky Mountain (PADD 4) average.
A year of driving
| At 12,000 miles | Per year | Per month |
|---|---|---|
| Gas car (28 MPG) | $1,806 | $150 |
| EV, all home charging (3.5 mi/kWh) | $458 | $38 |
| EV, 80% home / 20% public at $0.45/kWh (assumption) | $675 | $56 |
Idaho ranks #5 of 51 for the lowest home charging cost per mile (1 = cheapest). See all states.
Your own car, miles and electricity plan matter more than the state average. Change the numbers or price a single drive with the trip cost calculator.
Sources and assumptions
- Gas prices: U.S. EIA, Gasoline and Diesel Fuel Update — U.S. Regular Gasoline Retail Prices (all taxes included). Week of 2026-11-02 (released 2026-11-03; retrieved 2026-11-03). EIA publishes weekly prices for nine states; for the others we use the state’s EIA region, shown on each page. Regions follow EIA’s map of states in each region.
- Electricity: U.S. EIA, Electric Power Monthly Table 5.6.A — Average residential price of electricity by state (2026 values preliminary). August 2026 data (released 2026-10-23; retrieved 2026-11-03). Converted from cents per kWh.
- Example car and driving: 28 MPG gas car, 3.5 mi/kWh EV, 12,000 miles a year. These are the calculator’s editable starting values, not measurements of any specific vehicle.
- Public charging $0.45/kWh: an editable assumption, not sourced data. Used only in the “80% home” column.
- Energy cost only. Leaves out purchase price, incentives, insurance, maintenance, charger install and time-of-use rates.