Rivian R1S All-Terrain Tri Max (20in) MPG by year — every rating on record
The Rivian R1S All-Terrain Tri Max (20in) has a combined EPA fuel economy rating for 2 model years, from 2025 to 2026. Across those years its best rated version returned 68 mpg (2025) and its thirstiest returned 68 mpg (2025). The EPA record holds 2 configurations for this nameplate, most recently a Standard Sport Utility Vehicle 4WD.
In the EPA record this nameplate also appears as R1S All-Terrain Tri Max (20in) and R1T All-Terrain Tri Max (20in). The figures below cover every one of them.
Year-by-year EPA ratings
| Model year | Configurations | Best combined | Worst combined | Class rank that year | Drivetrains | Fuel | EPA class |
|---|---|---|---|---|---|---|---|
| 2025 | 1 | 68 mpg | 68 mpg | #57 of 192 (71th pct) | 4-Wheel Drive | Electricity | Standard Sport Utility Vehicle 4WD |
| 2026 | 1 | 68 mpg | 68 mpg | #62 of 191 (68th pct) | 4-Wheel Drive | Electricity | Standard Sport Utility Vehicle 4WD |
Where it has stood in its class
Ranked against every other nameplate the EPA filed under the same class that year. The Rivian R1S All-Terrain Tri Max (20in) placed highest in 2025 at #57 of 192, and lowest in 2026 at #62 of 191. It spent 2 of its 2 ranked years in the top half of its class.
Every configuration on record
All 2 configurations EPA lists for this nameplate, newest first.
| Year | Configuration | Engine detail | City | Highway | Combined | Gallons/yr | Barrels/yr | EPA fuel cost/yr | Range | CO2 g/mi | GHG |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 4-Wheel Drive Automatic (A1) Electricity | EV | 72 | 63 | 68 | 169.1 | 0.1 | $1,100 | 329 mi | n/a | 10/10 |
| 2025 | 4-Wheel Drive Automatic (A1) Electricity | EV | 72 | 63 | 68 | 169.1 | 0.1 | $1,100 | 329 mi | n/a | 10/10 |
What R1S All-Terrain Tri Max (20in) fuel costs over a year
At the EPA's 11,500 miles a year, the 2026 Rivian R1S All-Terrain Tri Max (20in) burns 169 to 169 gallons depending on configuration. Below is what that costs at three pump prices, and how much more the thirstiest configuration costs than the most efficient one.
| Pump price | Most efficient | Thirstiest | Spread |
|---|---|---|---|
| $3.00/gal | $507 | $507 | $0 |
| $3.50/gal | $592 | $592 | $0 |
| $4.00/gal | $676 | $676 | $0 |
EPA’s own estimate for the 2026 model year is $1,100 to $1,100 a year in fuel, or $5,750 less than the average new vehicle over five years.
How it compares with other Standard Sport Utility Vehicle 4WD
Across the 317 nameplates EPA classifies as Standard Sport Utility Vehicle 4WD, the median best combined rating is 22 mpg. At 68 mpg the Rivian R1S All-Terrain Tri Max (20in) is 46 mpg better the median, which is worth about $1,238 a year at $3.50 a gallon.
- All Standard Sport Utility Vehicle 4WD rankings — every nameplate in the class, best to worst.
Other Rivian nameplates
Every Rivian model compared → — all nameplates ranked by best combined rating, with what each one costs a year.