2026 Rivian R1S Tri Max (22in): home charging cost in Missouri

A 2026 Rivian R1S Tri Max (22in) draws 44.6 kWh per 100 miles per the EPA; at Missouri's 13.45¢/kWh residential rate that's $5.99 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home is much cheaper than gas here: 62.6% less than gas per mile, here specifically.

What a year of driving costs

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Tri Max (22in) charged at home in Missouri costs about $899/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,504 a year.

Cost of a full charge

A 2026 Rivian R1S Tri Max (22in) needs roughly 165.4 kWh to reach its EPA-rated 371-mile range, which runs about $22.24 at 13.45¢/kWh in Missouri.

How this compares nationally

This combination ranks 9,410 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Tri Max (22in) alone ranks 356 of 400 models for efficiency; Missouri alone ranks 7 of 51 states for electricity price.

Next step: home charger installation

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

Get quotes from local electricians for Level 2 charger installation in Missouri before deciding.

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Curious how Missouri's 13.45¢/kWh compares? The guide to charging cost by state ranks every state side by side.