The Lexus IS300h's hybrid drivetrain is a slightly older generation of the technology. The new Corolla's 2.0-litre hybrid setup should be more efficient thanks to better energy management and a slightly larger battery. Testers also noticed it performs better on part-throttle and feels more natural to drive than the older Toyota/Lexus hybrid systems. It'll also run in electric-only mode for short periods at up to 70mph, whereas the Lexus won't above around 50mph.