What a difference a day makes.
Five days a week I drive my wife to her work then return home to enjoy my retirement(!). The entire trip is just over 7 miles in length, through urban streets, and commencing at 06:20 (so traffic is never an issue). I have a ScanGauge E fitted to my 2006 Honda Jazz. What I have noticed is that on a rainy day, the average mpg displayed is 10%, sometimes as much as 15% poorer, than on a dry day. I know it is not a very scientific result, as there are so many other variables, but it gives an idea just how detrimental rain can be to good FE.
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2009 Skoda Fabia Elegance 1.4 16V
 
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