Charging a 2027 Rivian R1S Performance (20in AT) at home in Wyoming

At Wyoming's residential electricity rate of 13.88¢/kWh, a 2027 Rivian R1S Performance (20in AT) (rated 49.8 kWh per 100 miles by the EPA) costs $6.92 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 56.8% cheaper per mile than gasoline in Wyoming — charging at home is much cheaper than gas here.

What a year of driving costs

Wyoming owners putting 15,000 annual miles on a 2027 Rivian R1S Performance (20in AT) spend about $1,038 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,365 saved annually, at this mileage.

Filling up the 2027 Rivian R1S Performance (20in AT), in dollars

At Wyoming's rate, fully covering this 2027 Rivian R1S Performance (20in AT)'s 329-mile EPA range costs about $22.76 (164 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 2027 Rivian R1S Performance (20in AT) in Wyoming ranks 12,897 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance (20in AT) ranks 386 of 400 EV models for raw efficiency, and Wyoming ranks 12 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 Wyoming 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. Wyoming's 13.88¢/kWh rate ranks 12 of 51 states; the state rate guide lays out the full spread.