I thought the wheels are 18"?
No, 17" just like base, but with a machined surface and painted pockets. 18" are available as an option.
I look at it this way: I want to buy a good value. Ford charges over $3,000 for the premium model - but how much does it cost them to build a premium over a base? $300? $600?
I really don't know. But I have the feeling buying a premium means giving Ford WAY more profit than buying a base. And it's my hard earned $...