Join Date: Jul 2005
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All cars use slightly more fuel in winter due to much more use of heating,lights,fans etc - all are a drain on the engines power. Also diesels are very efficient engines ( or at least modern comon rail engines are) and take a while to warm up - so in cold weather they take longer to warm up.
Whilst it wouldn't make a difference on the same tank of diesel, but also diesel companies add an anti-waxing agent to diesel during the winter to stop the diesel waxing up in freezing conditions - this slightly affect mpg as well.
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2010 Laguna III SportTourer Initiale Tom Tom.