This is on the Fiat comformatic gearbox and it changes the rev level before there is a gear change. For example, if you are going up a long hill it's possible that the gearbox will change up a gear and you end up in too high a gear for the hill. Engaging the up button means that the MH will stay in the lower gear for longer.
Makes a big difference in hilly areas - I use it a lot. For example it generally stops the box changing gear part way round a hairpin bend.
It also gives you more engine braking downhill.
So it it a bit like 'sport' mode in so much as it broadly increases the rpm point when a gear change occurs.
Living where I do I engage it before leaving home, until I'm down to the bottom of the valley. Vice versa coming home for coming back up the steep hill up to our house.
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