Charging a 2026 BMW i4 eDrive40 Gran Coupe (19 inch Wheels) at home in Montana

A 2026 BMW i4 eDrive40 Gran Coupe (19 inch Wheels) draws 31.1 kWh per 100 miles per the EPA; at Montana's 13.77¢/kWh residential rate that's $4.28 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 73.3% cheaper per mile than gasoline in Montana — charging at home costs a fraction of what gas would here.

Annual cost, at 15 thousands miles a year

Montana owners putting 15,000 annual miles on a 2026 BMW i4 eDrive40 Gran Coupe (19 inch Wheels) spend about $642 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,761 saved annually, at this mileage.

What one full charge costs

At Montana's rate, fully covering this 2026 BMW i4 eDrive40 Gran Coupe (19 inch Wheels)'s 307-mile EPA range costs about $13.15 (95.5 kWh) — the energy the EPA test actually used, not the battery's rated size.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 BMW i4 eDrive40 Gran Coupe (19 inch Wheels) in Montana ranks 1,660 for cost savings versus gas — 1 being the best deal nationally. Separately, the BMW i4 eDrive40 Gran Coupe (19 inch Wheels) ranks 77 of 400 EV models for raw efficiency, and Montana ranks 10 of 51 for cheapest residential electricity.

Before you install a home charger in Montana

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 Montana electrician to quote the install before this math becomes a real decision.

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. Montana's 13.77¢/kWh rate ranks 10 of 51 states; the state rate guide lays out the full spread.