My satnav is the same as the digital speed read out in the Zed, the speedo is 1 or 2 mph behind at 70 MPH.
In the X-trail the speedo is 10% fast at all speeds, a known "fault" on the 2.2 diesels
I know it's silly, but the aircon only chills if the light is on - you did check this?
check you didn't knock the heated seat switch to "ON"
Leaving the aircon on all the time stops the musty smell developing
RE050s are some of the best tyres you can put on the Zed, stick with them and don't downgrade to the Falkens
+1 for standard sizes, even if they are a bit noisy
Added Mitch
Ditto
Knowing what some prick i went to school with is having for breakfast or the everday drama's of morons has kind of lost it's appeal.....
so block or delete those people and join the club page in facebook http://www.facebook.com/home.php?ref=home#!/group.php?gid=4863263215