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Unlike a gasoline engine, you're not going to suffer much pumping loss by not accelerating hard. Theoretically, you will get an even better BSFC when you get in to boost, because the engine can create more power per stroke (even less losses). So you won't waste fuel accelerating quickly, either...unless you are jack-rabbiting between lights and having to slam on your brakes and wasting your momentum each time. The only thing that will waste power is (sustained) revving up higher than you need to be.
I'd accelerate however I felt like at the time, and remember to shift somewhere around 2500-3000 rpm...or 2000-2500 if I'm in no hurry.
I've driven my TDI like I stole it, and I've driven it like a granny...it still gave me 40mpg (US) each way.
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