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If you want awesome instant passing power on the freeway/highway, especially on an incline, 50i all the way.
Also have E53 X5 3.0i and love the smooth inline-6 but the V8 is beast that makes the F15 X5 move like monster. Moves as fast as our E46 M3 but with much less fuss...
Fuel mileage on F15 50i is better than E53 3.0i on the highway if you are easy with it.
Did have F15 35i loaner and it is more than adequate and faster than most other SUV BUT does not have the same torquey/"scary fast acceleration to triple digits speed" of the 50i engine.
28K miles on 50i and so far so good...
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