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Diesel has 15% more energy per litre so it should have at least 15% less consumption. Typically a diesel version of the same car will have a lower diff ratio as well, combined with a more efficient engine design (no spark plugs and higher comp ratio) I'd expect 20-25% difference in fuel consumption would be about right.
Of course a PHEV might be able to match it for the first 100 or even 200 miles but at 500 miles the Diesel will always pull ahead.
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