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My guess about the brakes: the brake pad is too aggressive. When you tap the brakes, it grips too much. Aggressive brake pads don't make you stop shorter but they do change the braking feel.

It's possible that the rear parking brake needs adjustment. Maybe it is slightly rubbing and this causes your more than normal braking and low mileage.

Jack up the rear of the car and see if it's rubbing. A little touch between the pad and rotor is normal but resistance is not.

The other problems could be a boost or vaccum leak that you haven't found. Try this: http://www.myturbodiesel.com/1000q_how_to/multi/boostleaks.htm and then inspect all the vacuum lines. It's possible that there is a defect that you can't see somewhere.

And if this is a pumpe duse or automatic transmission, those will lower fuel economy compared to other units. I'm not sure if that year Euro golf is pumpe duse.
 

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Good idea, fix 1 thing at a time. When they check the MAF, make sure to really check it since a quick inspection won't reveal any fault. The normal mode of failure is a slow failure and low air reading, not a sudden failure. If they deal with VWs they probably know this.
 
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