Andrew Benson in an article on the BBC F1 website provides
an interesting insight into Vettel's driving style when cornering
the Red Bull when it still had the blown diffuser.
For example, he would destabilize the rear of the car on entry to get
it pointed quickly at the exit, then get on the throttle to get the
exhaust gasses blowing to create more downforce and grip.
Since the blown diffusers are banned in 2014, that trick no longer works and
Vettel has to change his driving style.
That and other insights here -
http://www.bbc.com/sport/0/formula1/27438960