Reduced Focus fuel economy

I run a 2009 Ford Focus 1.6TDCi Zetec which I have had since April 2011. I have consistently managed 54-55mpg. However since the car had a major service in November 2011 the average fuel economy has dropped to 50-51mpg. My driving style has remained unchanged as has the type of road journeys undertaken.

Is there anything undertaken as part of a service which may have affected the car's fuel economy, or could something else be affecting fuel economy such as the cooler winter weather?

Asked on 24 December 2011 by ajf23

Answered by Honest John
That's because it's now colder.
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