I lost 4 mpg by slapping heavy 18s on the TDI and made the ride alot harsher as well so ill likely get some 16s for her when the time comes just to make it back to what it really should be. Ill likely leave the FR-S very stock for the most part in fear of ruining it driving comfort for looks and handling like I have with my TDI. Thanks for the replies guys Ill have to start using the search button now I guess