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I'm sure others can explain that better than me, but a engine with a broad power band can have a long gear ratio to "work against" as it builds speed. With a very short gear ratio it would use the "wrong end" of the rev range. A Ferrari 458 needs closer and shorter ratios to maximize it's power band, a turbo engine wants longer ratios to take the most advantage of it's torque/power band.
Maybe Swamp2 could explain a bit better, have to get some sleep over here now...
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