Powertrain
Everything that generates and delivers a car's motion: engine or motor, battery or tank, and transmission. It defines which type of car you are comparing.
The powertrain is the complete system that moves the car: the engine or electric motor, the energy store (fuel tank, battery, or both), and the transmission that delivers power to the wheels. On CarPairly it is the first classification, because it determines which numbers are comparable between two cars.
CarPairly distinguishes five powertrains: BEV (battery only), HEV (hybrid), PHEV (plug-in hybrid), ICE (gasoline, including gasoline mild hybrids), and Diesel (including diesel mild hybrids). These roll up into two branches: Electric, which contains BEVs only, and Gas, which contains everything that burns fuel.
Powertrain is not the same as drivetrain. In CarPairly's data, drivetrain describes which wheels are driven (FWD, RWD, or AWD). When you filter cars on CarPairly, powertrain decides whether you compare kWh and charging speed or liters and mpg.