I plan on buying a 2016 cx-5 in the summer and I am planning on using the stock wheels for winter tires and getting a different set of tires and wheels for the summer months. I see people getting 20" wheels with 255 wide tires. What are the downsides other than the obvious harsher ride, and more road noise to expect with a size setup like this? Would there be a drastic difference in gas mileage? How about wear and tear on stuff like bushings and shocks, or steering components? Could an oversize tire and wheel set up void a CPO drive train warranty?