usually you should get 10,000 miles plus on the tyres, some of my customers get 20- 30 thousand miles which depends on the road conditions ie type of road surfaces, worn, dusty, gravel, windy roads etc.
Tyre pressures also effect the wear, A diesel car is heavier so the front tyres should be inflated to 32psi no lower or higher unless you carry heavy loads.
I don't recommend Continental tyres as the rubber compound is soft, try the Hankook range of tyres as they are a bit cheaper but last a great deal longer, Even Vw are starting to fit these tyres during servicing.
Also have you had the whole geometry of the suspension checked ie Castor, camber, tracking as these effect the front tyre wear. As your tyres are wearing quite quickly i suspect your tracking ie either towing in a great deal or towing out as the tyres are most probably scrubbing the road surface.

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