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I'm guessing that new parallel gear thingy that replaces the reduction gear will make up for the lost in torque in the electric motor? The MG2's torque has decreased from generation to generation.
Gen 1 - 225 lb-ft (JDM only)
Gen 1.5 - 258 lb-ft (the one we got)
Gen 2 - 295 lb-ft
Gen 3 - 153 lb-ft
Gen 4 - 120 lb-ft
main limiting factor is maximum battery output, not motor output. This is why combined power wasnt >170hp but 136hp... New motor seems to be able to run at higher speeds than old one (so it will be able to run on its own at higher top speeds than before, shutting down the engine during highway as well). Larger motor than needed is used to provide better brake regen, which now they increased despite having smaller motor (it is significantly better in G4).
However, there are rumors that total output is now smaller at 122hp (so 25hp battery output vs 37hp of old Prius) - not sure if thats realistic decrease since battery is exactly the same in power, or maybe they just changed the way they calculate this. They often mention stronger acceleration in PR's but they dont actually mention anywhere it is faster. So thats pretty much only big mystery left.
Another significant news is that max torque from the petrol engine is now 400 rpm lower at 3600 rpm... this means more relaxed acceleration since thats where Prius likes to go for most of acceleration demands (except for full WOT, which then goes to 1000 rpm more or so).
Specifically, five of the six total trim levels will be rated 54 mpg city, 50 highway, 52 combined, and the lighter Prius Two Eco promises 58 city, 53 highway, 56 combined.
The 2015 Prius was rated 51 mpg city, 48 highway, 50 combined.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.