Mercedes-Benz GLC-Class vs Porsche Cayenne: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Mercedes-Benz GLC-Class burns about $2,600 of fuel annually against $3,300 for the Porsche Cayenne. That $700 yearly gap compounds to roughly $3,500 over five years and $5,600 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 and highway economy: the Mercedes-Benz GLC-Class leads in both cycles — 26 mpg city and 33 mpg highway against 21 and 29 mpg — so its fuel-efficiency advantage holds whether you commute in traffic or cover long highway miles.

Powertrain choice: the Mercedes-Benz GLC-Class is recorded with 3 distinct engine configurations (SIDI; Mild Hybrid, SIDI; PHEV, SIDI), the Porsche Cayenne with 4 (SIDI, SIDI; PHEV, 4.0). Across 72 recorded Mercedes-Benz GLC-Class configurations and 97 for the Porsche Cayenne, 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 GLC-Class is offered with Rear-Wheel Drive, All-Wheel Drive, 4-Wheel Drive, the Porsche Cayenne with All-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 Mercedes-Benz GLC-Class emits 84 g/mile of CO2 versus 174 g/mile for the Porsche Cayenne. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.