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Which executive car has the lowest motorway road noise?

Can you tell me which executive car is the quietest to be in when cruising on the motorway?

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Mercedes-Benz S500 petrol PHEV hybrid: www.honestjohn.co.uk/road-tests/mercedes-benz/merc.../ But noter that the Government plug in hybrid grant has now been reduced from the figures in the test.
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Supremely comfortable with an elegant yet modern interior. Handles impressively well for such a big car. Reasonable economy and emissions.
 

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