what are the diferences between them two?

2.8

one has twin turbos and 250hp! (the other smells like bigffots d*ck)

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skeet skeet skeet

My 2.7T does around 22mpg UK. And my brothers 2.8 does around 27mpg extra urban as they now call it.
So in answer to your question. The 2.8 is more economical but also not so much fun. Both our cars are Tiptronic Avants.
My brother has just bought an RS6 Avant. 18mpg if your lucky, but I'll still take it.

Now thats one up manship.

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If only my A was an S