Quote:
Originally Posted by redpoint5
The only way in which a hybrid makes highway cruising more efficient is by downsizing the engine, thereby working it harder at steady cruise speed.
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Well, sort of... It's often mentioned the planetary gearset of a Prius for instance makes it easier for the electric motors to provide an effect similar to a CVT, but in the end the electric drive may also act sorta like a booster, so even at a more constant load the ICE won't be so likely to seem so underpowered even at a high speed.