I could be wrong, but I think a little bit of brake pad noise is acceptable. The wheels are heavy and won't spin very much in general. Especially if you just replaced the brakes..the pads might take a few days to wear in. The rotation seems ok to me, but I'll let someone with more experience have their say over mine!

As for boost, your mpg shouldn't suffer too much. I went without it for a few months and my mpg was basically the same that it is now. However, if you want to go fast, you might use more pedal for a longer period of time since your power will be down, and this could theoretically reduce mileage. Having the boost will also increase the fuel the engine gets, but you'll get more power so you won't have to use as much pedal.

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k