Shame man.
Going 6 speed was one of the best things I ever did for the car, feels amazing.
and is much better on a motorway cruise 
Now, this is an odd topic this one.
On Paper, it's really very little difference between 5th on the 5 speed and 6th on the 6 speed.
The difference in RPM at 70 isn't much at all, and I didn't expect to notice any difference.
but my god, it's REALLY different isn't it?
SOOOO much quieter and more calm on the motorway!