Based on my personal observation, for every 4-5 35i/35d, I see 1 50i in bay area. And interestingly I have seen many X5 without any trim!
35i is plenty quick but 50i is a completely different beast in power. You definitely don't "need" the much power, but it's there when you "want" it.
R33, I am not sure that's accurate, I couldn't get more than 19mpg on 35i lol. I am sure I can at least obtain 15 on 50i.
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