I'd hope you could get 42 mpg - at the 65-70 speeds at which most V70's seem to cruise the motorways (perhaps for this very reason) and ideally with the aircon off, which seems to have a surprisingly significant impact for a large engined car. Certainly its use in the very hot weather walloped my mpg this summer. The very cold winter had the same effect. I'd better make the most of the current sweet spot!
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