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Hi,
Just a thought have you considered a TUnit or something similar ? - I think they match an eco4 engine (CR Diesel ?).
They are normally associated with more power but at "min" setting they may give you an economy edge. You may also find a higher power setting results in more economy with different driving techniques especially in the UK with our absence of long, straight highways.
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No longer here. Bye, and good luck to all. 
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