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We averaged about 15.5 in our mixed city highway with our 08 X5 4.8i. Our current 08 535xit gets 21.5 average. My 08 M3 averages 19.5. I think a diesel X5 would be great but am not sure the new ones with urea injection areas efficient. The X5 35i with newer 8 speed auto may be the way go go, plus the twin scroll turbo is more efficient than the twin turbo of a few years ago (like our 08 535xit).
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