BMW 8 Series vs Cadillac CT4: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Cadillac CT4 burns about $2,800 of fuel annually against $3,050 for the BMW 8 Series. That $250 yearly gap compounds to roughly $1,250 over five years and $2,000 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 Cadillac CT4 leads in both cycles — 23 mpg city and 34 mpg highway against 23 and 30 mpg — so its fuel-efficiency advantage holds whether you commute in traffic or cover long highway miles.

Powertrain choice: the BMW 8 Series is recorded with 1 distinct engine configuration (SIDI), the Cadillac CT4 with 1 (SIDI). Across 64 recorded BMW 8 Series configurations and 52 for the Cadillac CT4, 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 BMW 8 Series is offered with All-Wheel Drive, Rear-Wheel Drive, the Cadillac CT4 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 Subcompact Cars and Compact 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 Cadillac CT4 emits 327 g/mile of CO2 versus 347 g/mile for the BMW 8 Series. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.