Why is my Passat's fuel consumption worsening?

I have a Volkswagen Passat BlueMotion with just 4,000 miles on the clock. The fuel consumption is increasing and has gone from 53mpg average in October to 48mpg now. Dealer says he can find no fault on electronic test rig. Any ideas please? Previously got over 60mpg on same journey now getting 48-49mpg and seeming to be dropping. Variables like fuel etc. all same as is possible and driving style not changed. Best regards and Happy New Year to all.

Richard Paterson (Solihull)

Jan 2012 Filed under: fuel economy and emissions

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Expert answer

Hi Richard,

Lots of potential reasons for this. Very first thing I'd look at is tyre pressures. Are they all even and to spec? Are there any other issues with the tyres you can see? Uneven wearing, etc. If no problems with pressures I'd suggest getting the alignment checked. If it gets knocked out (relatively easy to do with a pothole or kerb) then there could be more friction causing heavier fuel consumption.

Come back to us when you've checked that.

Shane O' Donoghue - Complete Car Adviser
@Shane_O_D