Quote:
Originally Posted by redpoint5
...The Gen II Prius had a smaller engine, but Toyota put a larger engine in the Gen III to increase torque and keep the electric motor from working so often...
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...and, the reasons for switching to a larger engine were:
1) obtain more TORQUE at lower engine RPMS
2) which permitted use of lower CVT final ratio
3) obtain better
FUEL ECONOMY (+10%)
4) make Atkinson engine more EFFICIENT overall
5) standardize engine block production for lower production costs