Dash rattle. See:
http://www.brickboard.com/AWD/index.htm?id=637129
On milage. I have seen 19 mpg with 50% city/highway to
25.6 with 90% highway. So it varies greatly by how
you drive. My T5 has a computer that reads out the milage
and those numbers are across thousands of miles (currently
at 25.6 in past 2800 miles with about 90% freeway driving).
TRACS only engauges when one of the front wheels starts
to slip. It won't affect milage.
A stock air filter flows enough air for the turbo engine so
that is not an issue.
You might check tire pressure.
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