2026 head-to-head · Midsize & Large SUV
2026 Cadillac Optiq vs Mercedes-Benz EQS
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
On fuel costs these two are nearly tied. Driving 15,000 miles a year with 18¢/kWh electricity, the most efficient 2026 Cadillac Optiq (105 MPGe) costs about $867 a year to fuel and the 2026 Mercedes-Benz EQS (98 MPGe) about $918.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Cadillac Optiq
- Mercedes-Benz EQS
Side by side
| Cadillac Optiq | Mercedes-Benz EQS | |
|---|---|---|
| $867 | Your annual fuel cost | $918 |
| 105 MPGe | Combined efficiency | 98 MPGe |
| 117 MPGe | City | 98 MPGe |
| 93 MPGe | Highway | 98 MPGe |
| 32.1 kWh | Electricity use (kWh/100 mi) | 34 kWh |
| 317 mi | Driving range | 390 mi |
| 102 cu ft | Passenger volume | 103 cu ft |
| 26 cu ft | Cargo volume | 35 cu ft |
| 0 g/mi | Tailpipe CO₂ (g/mi) | 0 g/mi |
| 9/10 | EPA fuel economy score | 9/10 |
| 10/10 | EPA greenhouse gas score | 10/10 |
| 9.5 hrs | Charge time at 240V | 14 hrs |
| Electric | Powertrain | Electric |
| Electricity | Fuel | Electricity |
| Electric motors (465 kW) | Engine / motor | Electric motor (265 kW) |
| Single-speed | Transmission | Single-speed |
| RWD | Drivetrain | RWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Cadillac Optiq vs Mercedes-Benz EQS across model years
- Cadillac Optiq
- Mercedes-Benz EQS
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
The Mercedes-Benz EQS goes farther between stops: about 390 miles on a charge, compared with 317 miles for the Cadillac Optiq.
Per EPA interior volume figures, the Mercedes-Benz EQS has more cargo space (35 vs. 26 cu ft).
Among 91 2026 midsize & large SUVs, the Cadillac Optiq ranks 3rd and the Mercedes-Benz EQS 6th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2026 Cadillac Optiq or the 2026 Mercedes-Benz EQS?
Measured by cost to drive, the Cadillac Optiq. The Cadillac Optiq is rated 105 MPGe combined and the Mercedes-Benz EQS 98 MPGe (EPA, most efficient configuration of each).
How much does it cost to fuel the 2026 Cadillac Optiq vs. the Mercedes-Benz EQS per year?
At 15,000 miles a year with 18¢/kWh electricity, about $867 for the Cadillac Optiq and $918 for the Mercedes-Benz EQS.
Which has more range?
The Mercedes-Benz EQS: about 390 miles versus 317 miles.
Which has more cargo space?
The Mercedes-Benz EQS, with 35 cu ft of luggage volume versus 26 cu ft (EPA interior volume index).
Cadillac Optiq vs Mercedes-Benz EQS in other years
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