Infiniti QX80 vs Lexus LX: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Lexus LX burns about $3,800 of fuel annually against $4,200 for the Infiniti QX80. That $400 yearly gap compounds to roughly $2,000 over five years and $3,200 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 Lexus LX leads in both cycles — 19 mpg city and 22 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 QX80 is recorded with 4 distinct engine configurations (SIDI, SIDI; MDPV, SIDI; MDPV (Curb Weight >6000 lbs)), the Lexus LX with 3 (SIDI & PFI; Hybrid, SIDI & PFI, 5.7). Across 30 recorded Infiniti QX80 configurations and 14 for the Lexus LX, 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 QX80 is offered with 4-Wheel Drive, Rear-Wheel Drive, the Lexus LX with All-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 Standard 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 Lexus LX emits 439 g/mile of CO2 versus 504 g/mile for the Infiniti QX80. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.