From what I understand my 07 didn't have adaptive drive. This is the sport button by the emergency break button ? I really have to put more miles on my 35d before I make a final decision, but the 35d does feel like its heavier. However it may all be in my head. I've not looked at the weight numbers on how the diesel engine compares the all aluminum 4.8i maybe there's a couple extra hundred pounds there.... I am still enjoying every excuse to drive though.