2015 head-to-head · Small SUV
2015 Lexus RX vs Mercedes-Benz GLK-Class Diesel
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
4WD · 2.1L 4-cyl turbo · 7-speed automatic · 27 MPG
The 2015 Mercedes-Benz GLK-Class Diesel is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas and $3.70/gal diesel fuel, it costs about $2,056 a year to fuel (27 MPG), versus $2,214 for the 2015 Lexus RX (21 MPG). That's roughly $159 a year, or about $794 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
- Lexus RX
- Mercedes-Benz GLK-Class Diesel
Side by side
| Lexus RX | Mercedes-Benz GLK-Class Diesel | |
|---|---|---|
| $2,214 | Your annual fuel cost | $2,056 |
| 21 MPG | Combined efficiency | 27 MPG |
| 18 MPG | City | 24 MPG |
| 25 MPG | Highway | 32 MPG |
| 429 g/mi | Tailpipe CO₂ (g/mi) | 371 g/mi |
| 5/10 | EPA fuel economy score | 7/10 |
| 5/10 | EPA greenhouse gas score | 6/10 |
| Gas | Powertrain | Diesel |
| Regular gasoline | Fuel | Diesel |
| 3.5L 6-cyl | Engine / motor | 2.1L 4-cyl turbo |
| 6-speed automatic | Transmission | 7-speed automatic |
| FWD | Drivetrain | 4WD |
✓ 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.
Lexus RX vs Mercedes-Benz GLK-Class Diesel across model years
- Lexus RX
- Mercedes-Benz GLK-Class Diesel
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
Among 60 2015 small SUVs, the Lexus RX ranks 39th and the Mercedes-Benz GLK-Class Diesel 35th for lowest fuel cost.
The powertrains differ: the Lexus RX is a conventional gas model, while the Mercedes-Benz GLK-Class Diesel is a diesel.
Frequently asked questions
Which is more fuel-efficient, the 2015 Lexus RX or the 2015 Mercedes-Benz GLK-Class Diesel?
Measured by cost to drive, the Mercedes-Benz GLK-Class Diesel. The Lexus RX is rated 21 MPG combined and the Mercedes-Benz GLK-Class Diesel 27 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Lexus RX vs. the Mercedes-Benz GLK-Class Diesel per year?
At 15,000 miles a year with $3.10/gal regular gas and $3.70/gal diesel fuel, about $2,214 for the Lexus RX and $2,056 for the Mercedes-Benz GLK-Class Diesel.
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