The point of travel isn't to get the best fuel economy, but to arrive at the destination, the sooner the better.
The Prius is a fantastic vehicle; very practical and fuel efficient. There's not much point in pushing the efficiency further because of the law of diminishing returns.
Toyota once set a goal of improving efficiency 10% with each generation of Prius, but they hardly improved it at all from 3rd to 4th. It was foolish to make such a goal considering diminishing returns makes each 10% improvement much more difficult than the preceding improvement.
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