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F22
I have a 6 speed f22 with bootmod3 stage 1. I realize mine is b58 not s58, but they are both 3 litre engines. I get 25 plus every day driving. Is the m2 geared lower? What rpm are you turning at 70? 20%worse mileage? I can get 30 plus with cruise control on. Just like a new 240. Would be interesting what a bmw engineer says
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