Hi there, at what speed does the dualogic go into 6th? Seems to old onto 5th even at 100kmh. Wouldn't go into 6th in Manual mode too.

It can't go into 6th, as the dualogic only has 5 gears.
At least according to Fiat spec sheets: http://www.fiatautopress.com/download/GRUPPO01~07_SCHEDE_TECNICHE_F/070705_F_Fiat500_ST_GBR.pdf

That's right - only 5.

Thanks dudes!