I have the IS 220d Sport - collected it about two weeks ago. I tend to keep it in 5th until around 75-80 mph then change up.
You can make use of this gear a lot earlier than the regular 220d I've stayed in 6th at about 60mph but responsivness obviously sufferers slightly.
At present I get about 33mpg combined.
As regards the gearbox, 1st gear is a waste of time and it generally works best if you commence in 2nd.
B)-->
QUOTE(Carlos B @ Apr 7 2006, 06:31 PM) ←
The gearing change should mean that the sport accelerates quicker, 6th becomes more usable but unfortunately the engine will be revving higher for any given speed so the fuel economy will suffer...unless of course if you can use 6th more often where it may balance out a bit as for the non-sport guys 6th is virtually unusable.