Mercedes-Benz GLB-Class vs Volvo XC90: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Mercedes-Benz GLB-Class burns about $2,700 of fuel annually against $2,800 for the Volvo XC90. That $100 yearly gap compounds to roughly $500 over five years and $800 over eight — often more than the price difference between two trims of the same vehicle, and the single largest running-cost line item separating these two.

City versus highway split: the Volvo XC90 is the stronger commuter at 26 mpg city, while the Mercedes-Benz GLB-Class pulls ahead on the interstate at 33 mpg highway. If most of your driving is stop-and-go traffic the city figure is the one to weigh; for long-distance highway mileage the reverse is true, and the two vehicles effectively swap places depending on how you drive.

Powertrain choice: the Mercedes-Benz GLB-Class is recorded with 2 distinct engine configurations (SIDI; Mild Hybrid, SIDI), the Volvo XC90 with 4 (SIDI; Mild Hybrid, SIDI; PHEV, 2.0). Across 20 recorded Mercedes-Benz GLB-Class configurations and 43 for the Volvo XC90, the wider the engine spread the more the real-world fuel efficiency depends on which version you actually buy, so check the specific model year and drivetrain rather than the headline number.

Drivetrain and class: the Mercedes-Benz GLB-Class is offered with Front-Wheel Drive, All-Wheel Drive, 4-Wheel Drive, the Volvo XC90 with All-Wheel Drive, Front-Wheel Drive. All-wheel drive typically costs one to two mpg combined against the same vehicle in front- or rear-wheel drive, which is worth remembering when the gap between these two is small. The EPA classes them as Small Sport Utility Vehicle 4WD and Standard Sport Utility Vehicle 4WD respectively — the class drives the interior volume, cargo space and passenger space each one is measured against.

Tailpipe emissions: at their cleanest configurations the Volvo XC90 emits 131 g/mile of CO2 versus 311 g/mile for the Mercedes-Benz GLB-Class. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.