The new 35d's still have the eco credit in the US, $3,500 off according to bmwusa, so that's nice in comparison to a 35i Premium, considering the d is $1,500 higher to start.

I have a 2012 and love it, I do mostly highway driving and the mileage has been creeping up as it ages, got 27 mpg on my last tank which was 95% highway (almost 550 miles). My lifetime over 25k miles is just under 23.

Diesel prices vary a lot, I use gasbuddy to search out stations and I log the price of 93 every time I buy. Diesel can range anywhere from .10 less to .45 more than 93 depending on the state and time of year.

Good luck with your decision!

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16 X5 50i


prior:
12 X5 35d
06 X5 3.0
06 Z4 3.0