The Citroen C5 1.6HDi is the French manufacturer’s way of saying that their saloon and tourer versions are now greener and with leaner performance.
The 110 horsepower engine in the Citroen C5 1.6HDi has been re-homologated and CO2 emissions have dropped by 10g per Km from 140 g to 130 g. Fuel efficiency in a combined cycle has also improved 6 percent to 56.5 miles per gallon so this means the Citroen C5 1.6HDi qualifies for free road tax in
the first year.
Further fuel efficiency figures indicate that in an urban cycle the Citroen C5 1.6HDi does 44.1 mpg while in extra urban cycle the car returns 67.3 mpg.

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Source: Citroen