Yeah, man. Sorry, your car is very very nice, but I have swapped out an entire (tan) interior before and it is something I would rather avoid doing.
Hhhmmm, only 25mpg huh? That is bad news. I am averaging 22ish with a heavy foot and 80% highway. For some reason I recall my 318is averaging closer to 29. Its been years though and I didn't really pay as much attention to my gas mileage as I do now haha.