My ix35 has this feature and like the OP, I feel that it always asks for a change up too early. Having said that, the engine always seems to have the torque available to do it.
My dad has a 1.6hdi Xsara Picasso, drives it like a vicar, would put his cruise control on at 25mph in 5th if he could! Engine always sounds under pressure that he has changed up too early.
Having said that, he averages 58mpg in his car and when I drive it, to my style and engine sympathies, I can never better 51mpg.
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