[lkchris]

In the real world, here's what you'll accomplish fitting larger than oem tires:

You'll make the tire company happy because they've sold you a more expensive tire.

You'll have increased your car's unsprung weight, affecting handling and fuel mileage.

You'll have increased your car's rolling resistance, affecting fuel mileage.

You'll have decreased your car's traction capabilities on wet or snowy roads.