Here's a good site to look at for curb to curb turning "radius". You can select a type of vehicle for comparison and then compare by turning radii. Note the figures are more accurately a turning "diameter" which is why I divided by two.

http://www.theautochannel.com/newcar...parachart.html

The Mini (all varieties) is listed at 17.5' (35') so it shouldn't be turning tighter than the crossfire or miata. Surprisingly my Olds Alero (35.1') turns just about as tight as a mini. The Crossfire is listed at 32.2' for 2005 models but only 32.9' for the 2004. I'm not sure why there is a slight difference even though the 2004 SLK shared the same 32.9' figure.