would want to, but its just not worth it, other drivers might not be able to think as fast as you can drive, being in the wrong lane on a roundabout could cause some mildly lethal inconvenience if someone chooses to appear at the junction.
Believe m i'm going fast enough. I can do a bend on a country lane near me that is rougly 90 degrees at 60mph. The Focus could go round it faster but it's scary at 60 as it is so never pushed it beyond that.