2026 head-to-head · Large Car
2026 Genesis G80 vs Mercedes-Benz S-Class
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
AWD · 6.0L 12-cyl turbo · 9-speed automatic · 15 MPG
The 2026 Genesis G80 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,576 a year to fuel (23 MPG), versus $3,950 for the 2026 Mercedes-Benz S-Class (15 MPG). That's roughly $1,374 a year, or about $6,870 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Genesis G80
- Mercedes-Benz S-Class
Side by side
| Genesis G80 | Mercedes-Benz S-Class | |
|---|---|---|
| $2,576 | Your annual fuel cost | $3,950 |
| 23 MPG | Combined efficiency | 15 MPG |
| 20 MPG | City | 12 MPG |
| 29 MPG | Highway | 20 MPG |
| 107 cu ft | Passenger volume | 115 cu ft |
| 15 cu ft | Cargo volume | 12 cu ft |
| 382 g/mi | Tailpipe CO₂ (g/mi) | 603 g/mi |
| 5/10 | EPA fuel economy score | 2/10 |
| 5/10 | EPA greenhouse gas score | 2/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 2.5L 4-cyl turbo | Engine / motor | 6.0L 12-cyl turbo |
| 8-speed automatic | Transmission | 9-speed automatic |
| AWD | Drivetrain | AWD |
✓ 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.
Genesis G80 vs Mercedes-Benz S-Class across model years
- Genesis G80
- Mercedes-Benz S-Class
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
Per EPA interior volume figures, the Mercedes-Benz S-Class has more passenger space (115 vs. 107 cu ft); the Genesis G80 has more cargo space (15 vs. 12 cu ft).
Among 24 2026 large cars, the Genesis G80 ranks 16th and the Mercedes-Benz S-Class 22nd for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2026 Genesis G80 or the 2026 Mercedes-Benz S-Class?
Measured by cost to drive, the Genesis G80. The Genesis G80 is rated 23 MPG combined and the Mercedes-Benz S-Class 15 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2026 Genesis G80 vs. the Mercedes-Benz S-Class per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,576 for the Genesis G80 and $3,950 for the Mercedes-Benz S-Class.
Which has more cargo space?
The Genesis G80, with 15 cu ft of luggage volume versus 12 cu ft (EPA interior volume index).
Genesis G80 vs Mercedes-Benz S-Class in other years
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