Stoney, according to the Green Vehicle Guide you've got your fuel figures for the 125 mixed around - manual g/box combined is 6.3 L/100 while DSG g/box combined is 6.6....which will make the increase make a little more sense.
Looks like VW don't recommend either the 125kW TDi or TSi models for towing either....which might be due to bespoke bumpers and sport suspension.
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