To my knowledge, Toyota has never published a torque output for the electric motor and ICE combined, only a power output. For the Gen 3, max torque of MG2 was 153 lb-ft (207 Nm), and of the ICE was 105 lb-ft (142 Nm); there's no way the system is putting out anywhere close to 500 Nm. One person over at Priuschat has dynoed his Gen 2, and saw 119 lb-ft max at the wheels. For Gen 4, Toyota is claiming a reduction in MG2 torque, to 120 lb-ft, and ICE torque unchanged.
For 2016, every Prius but the Two comes with a lithium-ion battery, but only the Two Eco is rated 56mpg combined.
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