2021 head-to-head · Compact Car
2021 Acura ILX 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.
FWD · 2.4L 4-cyl · 8-speed dual-clutch · 28 MPG
The 2021 Acura ILX is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,116 a year to fuel (28 MPG), versus $2,962 for the 2021 Mercedes-Benz S-Class (20 MPG). That's roughly $846 a year, or about $4,232 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
- Acura ILX
- Mercedes-Benz S-Class
Side by side
| Acura ILX | Mercedes-Benz S-Class | |
|---|---|---|
| $2,116 | Your annual fuel cost | $2,962 |
| 28 MPG | Combined efficiency | 20 MPG |
| 24 MPG | City | 16 MPG |
| 34 MPG | Highway | 26 MPG |
| 89 cu ft | Passenger volume | 88 cu ft |
| 12 cu ft | Cargo volume | 7 cu ft |
| 316 g/mi | Tailpipe CO₂ (g/mi) | 454 g/mi |
| 6/10 | EPA fuel economy score | 4/10 |
| 6/10 | EPA greenhouse gas score | 4/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 2.4L 4-cyl | Engine / motor | 4.0L 8-cyl turbo |
| 8-speed dual-clutch | Transmission | 9-speed automatic |
| FWD | 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.
Acura ILX vs Mercedes-Benz S-Class across model years
- Acura ILX
- 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 Acura ILX has more cargo space (12 vs. 7 cu ft).
Among 37 2021 compact cars, the Acura ILX ranks 23rd and the Mercedes-Benz S-Class 35th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2021 Acura ILX or the 2021 Mercedes-Benz S-Class?
Measured by cost to drive, the Acura ILX. The Acura ILX is rated 28 MPG combined and the Mercedes-Benz S-Class 20 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2021 Acura ILX vs. the Mercedes-Benz S-Class per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,116 for the Acura ILX and $2,962 for the Mercedes-Benz S-Class.
Which has more cargo space?
The Acura ILX, with 12 cu ft of luggage volume versus 7 cu ft (EPA interior volume index).
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