Infiniti QX50 vs Nissan Armada: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Infiniti QX50 burns about $2,800 of fuel annually against $3,850 for the Nissan Armada. That $1,050 yearly gap compounds to roughly $5,250 over five years and $8,400 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 Infiniti QX50 leads in both cycles — 24 mpg city and 31 mpg highway against 16 and 20 mpg — so its fuel-efficiency advantage holds whether you commute in traffic or cover long highway miles.

Powertrain choice: the Infiniti QX50 is recorded with 3 distinct engine configurations (SIDI & PFI, SIDI & PFI; VCR, 3.7), the Nissan Armada with 4 (SIDI, SIDI; MDPV, SIDI; LDT). Across 20 recorded Infiniti QX50 configurations and 29 for the Nissan Armada, 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 Infiniti QX50 is offered with Front-Wheel Drive, All-Wheel Drive, Rear-Wheel Drive, the Nissan Armada with Rear-Wheel Drive, 4-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 2WD 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 Infiniti QX50 emits 336 g/mile of CO2 versus 497 g/mile for the Nissan Armada. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.