I imagine in some circumstances, a hybrid like a Prius would be fantastically economical to run. A modern diesel with a bias towards economy must take some beating at motorway speeds though. I was reading a review of a new Seat in the Guardian magazine at the weekend; the fuel efficiency offered by the new generation diesels is incredible! On a related note, my father in law has a Honda Civic IMA and on long runs, used to give significantly fewer MPG than my old BX TD!
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