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Welcome.
Audio depends on what you are looking for, how much space you want to give up and how much you are looking to spend.
Other parts. Like said not alot of aftermarket, but doing your own stuff can go along way.
As far as mileage. If you calculated yourself and got that amount great. My xD averages between 28 and 32 depending on how I drive or my wife drives. The average listed on teh instrument panel in normally off by about 2 to 3 mpg.
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