Bob -
I don't know. My off-the-cuff theory is that they went with a cheaper battery in the current gen Civic to make it more profitable. Here is a much better article :
Honda's fix for prematurely dying Civic hybrid batteries hurting fuel economy, performance? — Autoblog
Quote:
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Honda has not revealed details of the changes to the software other than to note that it limits cycling of the battery. Some owners are claiming that the revised software has cut both performance and mileage, in some cases by up to 20 percent. While this is clearly making some drivers unhappy, it has also caught the attention of the California Air Resources Board (CARB) because the battery is considered to be part of the emissions control system.
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CarloSW2