New to Yaris! But is my car okay?

[pjon]

I had a MMT Diesel Yaris which never struggled to reach 80-90mph with some to spare. The petrol version should be the same, so there's something wrong there! The MMT does take some getting used to and does need a bit of input from the driver. The electronics are a bit thick (stupid) at times.
Try anticipating the gearchanges and lift your foot off the accelerator momentarily to achieve a smoother gearchange.
As CTScott says, it might need a re-calibration/update at your Toyota dealer.
Also as CTScott indicated,Toyota cars purchased in the U.K. from June 2010 have a 5 year warranty (100000 miles) So your car is well within that. Get it back to the supplying dealer with your concerns. If you have no joy with them contact Toyota G.B. too.