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535I(XI) its pretty good on gas, has plenty usable power, and is Definately cheaper to own than the N63TU, alas, I have owned my 535i since June last year, and hasn't given me any issues whatsoever that popped up, I travel often, so mainly highway miles thus far, I get about 28-30mpg. N63TU is a beast of an engine, if you have equipment as stated and the lift, and time and the money, stick to what you heart is telling you and get a N63TU, I know you won't regret it. I was on that same big decision make last year and decided to go I6 Turbo, I am very pleased and happy with my N55.
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