Charging a 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels) at home in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels) (rated 45.1 kWh per 100 miles by the EPA) costs $5.77 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 64% cheaper per mile than gasoline in Idaho — charging at home is much cheaper than gas here.

What a year of driving costs

Idaho owners putting 15,000 annual miles on a 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels) spend about $865 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,538 saved annually, at this mileage.

Filling up the 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels), in dollars

At Idaho's rate, fully covering this 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels)'s 267-mile EPA range costs about $15.4 (120.3 kWh) — the energy the EPA test actually used, not the battery's rated size.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 BMW i7 M70 xDrive Sedan (20 inch Wheels) in Idaho ranks 8,285 for cost savings versus gas — 1 being the best deal nationally. Separately, the BMW i7 M70 xDrive Sedan (20 inch Wheels) ranks 360 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Next step: home charger installation

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

Ask a licensed Idaho electrician to quote the install before this math becomes a real decision.

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Idaho is one of the cheapest states for home electricity — the guide to why the cost varies so much by state covers what drives that.