What kind of driving do you do (short trips around the city or long freeway driving) and how many km's a week do you travel in the car?
TDI economy is only relevant when you do longer open road/highway driving. TDI's are not meant for stop/start driving and short trips around the city.
TDI's are not a common/popular choice in the Polo and A1, no doubt because they are "city cars" and the turbo petrol engines offered are very economical already.
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