My CDT manual has the standard stat, the gauge rises to 9 o'clock after a couple of miles, and stays there, whatever the conditions. Over the 16 months and 28,000 miles I've had it, it has averaged 45mpg, and I know others average closer to 50mpg. I take it that the brakes aren't binding, and that the oil, fuel and air filters have been changed? Might be worth booking one of the forum mechanics on here to give it the once-over, and connect it to T4 diagnostics.
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