I wasnt aware a 325 got 40mpg on the highway. I also wasnt aware that the 328 matched the 335i 0-60. The d does both(OK, .1 sec slower than the 335i).

And I don't care if it's a Chevy, a BMW, or a Ferrari, running an engine balls out at high RPM's constantly is going to wear it out faster than running it slower. That is just common sense. Why do you think rental cars run like hell after 50,000 miles? I'd like to know the service history of dealer loaners since they more than likely get driven harder than people's personal vehicles. I would be willing bet a bunch of money that the vast majority of 300,000 mile X5's were not redlined very often. Of course if you lease, it doesnt matter and becomes someone else's problem...... :-)

Maybe it's just my driving style, but I feel the d fits me better than the i. I like having tons of power available at low rpm's so I dont HAVE to rev it all the way up. In real world day-to-day driving how often do you really need or want to run 8000 rpm?