In article .com,
wrote:
AIUI the point is that it is (or can be) a more efficient IC engine
powered car since the IC engine can always be run under the most fuel
efficient conditions instead of being geared to the road wheels.

Only while there's some battery charge. Once that is exhausted, the petrol
engine is effectively driving the wheels direct, but via a generator and
electric motor or some form of split drive. Hence the poor consumption
under those conditions.

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*I just got lost in thought. It was unfamiliar territory.

Dave Plowman London SW
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