Welcome. I would imagine mpg would plummet, particularly if you use the increased performance, but that, after all, is the reason for adding those parts. Good luck, and enjoy your increased go!
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2009 Skoda Fabia Elegance 1.4 16V
![](https://badges.fuelly.com/images/smallsig-uk/1184372.png) ![](https://badges.fuelly.com/images/smallsig-us/1184372.png)
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