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The PHEV wouldn't have been my choice for a regular long journey, probably a diesel would have worked out cheaper overall.I would do as you suggest to maximise the fuel economy. You can't decide whether to use series or parallel mode when on the motorway, the car decides for you based on speed and load.The single biggest influence on fuel economy is the right foot - gentle acceleration and low top speeds will always be better.
The PHEV wouldn't have been my choice for a regular long journey, probably a diesel would have worked out cheaper overall.
I would do as you suggest to maximise the fuel economy. You can't decide whether to use series or parallel mode when on the motorway, the car decides for you based on speed and load.
The single biggest influence on fuel economy is the right foot - gentle acceleration and low top speeds will always be better.
