The Fiesta XR4 turning circle is 11.4m on the stock 17" wheels.
Iv'e had my XR4 for over 4 years now and I think it's something you just get used to, caught me out a couple of times when I first got the car but don't even think about it now, your driving style just changes to it.
I'm thinking of a Focus Titanium myself .. I think they look so good with those 5 spoke 18's !!! ..
Don't like the Sport wheels at all personally, way too busy, don't suit the car at all I reckon, no offence to those who have a Sport of course .. just my opinion, I'm sure Ford marketing have done their homework and know a whole lot more than little old me.