2018 head-to-head · Large Car
2018 Audi A8 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.
On fuel costs these two are nearly tied. Driving 15,000 miles a year with $3.95/gal premium gas, the most efficient 2018 Audi A8 (22 MPG) costs about $2,693 a year to fuel and the 2018 Mercedes-Benz S-Class (22 MPG) about $2,693.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Audi A8
- Mercedes-Benz S-Class
Side by side
| Audi A8 | Mercedes-Benz S-Class | |
|---|---|---|
| $2,693 | Your annual fuel cost | $2,693 |
| 22 MPG | Combined efficiency | 22 MPG |
| 19 MPG | City | 19 MPG |
| 29 MPG | Highway | 28 MPG |
| 107 cu ft | Passenger volume | 112 cu ft |
| 15 cu ft | Cargo volume | 12 cu ft |
| 397 g/mi | Tailpipe CO₂ (g/mi) | 403 g/mi |
| 4/10 | EPA fuel economy score | 4/10 |
| 4/10 | EPA greenhouse gas score | 4/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 3.0L 6-cyl supercharged | Engine / motor | 3.0L 6-cyl turbo |
| 8-speed automatic | Transmission | 9-speed automatic |
| AWD | 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.
Audi A8 vs Mercedes-Benz S-Class across model years
- Audi A8
- 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 (112 vs. 107 cu ft); the Audi A8 has more cargo space (15 vs. 12 cu ft).
Among 31 2018 large cars, the Audi A8 ranks 26th and the Mercedes-Benz S-Class 25th for lowest fuel cost.
Frequently asked questions
How much does it cost to fuel the 2018 Audi A8 vs. the Mercedes-Benz S-Class per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,693 for the Audi A8 and $2,693 for the Mercedes-Benz S-Class.
Which has more cargo space?
The Audi A8, with 15 cu ft of luggage volume versus 12 cu ft (EPA interior volume index).
Audi A8 vs Mercedes-Benz S-Class in other years
More 2018 comparisons
Audi A8 vs…
Or compare the 2018 Audi A8 with anything else: