Audi A8 vs Lexus LS: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Lexus LS burns about $2,700 of fuel annually against $2,850 for the Audi A8. That $150 yearly gap compounds to roughly $750 over five years and $1,200 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 versus highway split: the Lexus LS is the stronger commuter at 25 mpg city, while the Audi A8 pulls ahead on the interstate at 36 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 Audi A8 is recorded with 4 distinct engine configurations (SIDI; Mild Hybrid, SIDI; PHEV, SIDI), the Lexus LS with 3 (SIDI & PFI, SIDI & PFI; Hybrid; with ADS, SIDI & PFI; Hybrid). Across 28 recorded Audi A8 configurations and 47 for the Lexus LS, 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 Audi A8 is offered with All-Wheel Drive, 4-Wheel Drive, the Lexus LS with All-Wheel Drive, Rear-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 Large Cars and Midsize Cars respectively — the class drives the interior volume, cargo space and passenger space each one is measured against.

Tailpipe emissions: at their cleanest configurations the Audi A8 emits 213 g/mile of CO2 versus 314 g/mile for the Lexus LS. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.