I,ve had a 2006 Skoda Octavia 1.9tdi previously for 7 years (since new).It was a great car and the best diesel engine VAG built.Excellent on motorways but also great round town.The only thing that went wrong in those years was the Dual Mass Flywheel (known problem) which was converted to a solid flywheel under warranty.I did 70K with that car getting around 55-60 mpg.
My CT is roughly the same mpg but overall using the Fuelly app i,ve had an all time best of 73mpg.Obviously mine is a pre facelift so its zero tax.Silly idea that the exact same car from 2017 on is £140 tax?
Overall i prefer the CT for its luxury and so comfortable.As said previously think about future repairs on diesels such as DPF,EGR,DMF.A friend of mine has a 2015 Nissan X Trail 1.6 diesel and its nothing but trouble with constant engine management lights and the DPF which can never complete its regen cycle.Unlike older reliable diesels all the new Gen diesels are just total trouble and a nightmare when they fail,which is often.
I,ve had my CT since new (2011) and have never had anything go wrong so far (110K miles).Think wisely before making your choice.