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Drove both, M50i was very fast but the 40i isn't slow. Plenty fast for a large SUV. I don't have a reason to drive such a large vehicle so fast. I get 21MPG almost every tank in my 40i and its optioned similarly to the M50i that I drove. The startup sound on the V8 is much better but around town acceleration is more than enough (coming from F80 M3 Comp).
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