2026 Rivian R1S All-Terrain Dual Max (20in) MPG & Specs — Real Fuel Cost
Quick answer
The 2026 Rivian R1S All-Terrain Dual Max (20in) gets an EPA-estimated 82/73 MPG (city/highway) and 78 MPG combined, with an estimated $950/year fuel cost.
The 2026 Rivian R1S All-Terrain Dual Max (20in) with the listed electricity engine returns an EPA-estimated 82 MPG in the city and 73 MPG on the highway, for a combined 78 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | — |
| Transmission | Automatic (A1) |
| Drive | Part-time 4-Wheel Drive |
| Fuel type | Electricity |
| Vehicle class | Standard Sport Utility Vehicle 4WD |
| MPG — city | 82 |
| MPG — highway | 73 |
| MPG — combined | 78 |
| Annual fuel cost* | $950 |
| CO₂ tailpipe | — |
| EPA GHG score | 10/10 |
| Electric range | 370 mi |
How efficient is it?
As an all-electric vehicle, the 2026 Rivian R1S All-Terrain Dual Max (20in) is rated in MPGe rather than MPG, and running costs are dominated by electricity rather than fuel. That is about 159% better than the typical Standard Sport Utility Vehicle 4WD of its era (30 MPG class average), making it one of the more efficient choices in its class.
Fuel economy and running costs
At about $950 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2026 Rivian R1S All-Terrain Dual Max (20in). Over five years that is roughly $4,750 at today's prices — before insurance, maintenance, and depreciation.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.