Which of these models is most efficient?

What car is more fuel efficent: 2005 BMW 5 Series 2.2 petrol, 2005 BMW 5 Series 2.5 diesel or a 2007 Lexus IS 250 petrol - all automatics

Thanks

Sean McGeown (Dublin)

Apr 2013 Filed under: fuel economy and emissions

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Expert answer

Hi Sean,

According to the official figures, the comparison in terms of combined fuel economy is this: the 520i gets 28.8mpg, the 525d gets 36.2mpg and the Lexus IS 250 gets 31.0mpg. A clear win for the diesel 5 Series there, but it's worth remembering that these figures are taken from laboratory samples and you may have to knock off as much as 25% to get the real-world driving figure.

Hope that helps

Neil Briscoe - Complete Car Adviser
@neilmbriscoe