that's what mine does ( auto downshift / engine braking ), however no grinding noises when backing up ( except the passenger mirror noise as it lowers. )
i have noticed that in the 2500 miles i've put on the car since i bought it used, the tiptronic seems to be staying out of "grandma" mode and into the more sportier mode more often.
when i first got it, it seemed to always be in 5th gear by the time it was at 30mph.
now it seems to still be in 1st or 2nd ( thankgod ). it waits longer to shift up and quicker to shift down, unless it's already in 5th then it takes its sweet time, unless i punch it. and it'll jump down to 3rd or 4th.
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