No "real world" experience here, but I do have experience in the NASCAR world, although It won't apply to street cars, because we built everything to last one race, and it was all low to zero drag components. Numbers there are unbelievably low, but it only has to make it one race...
What drivetrain are you contemplating? Not only the gearbox, but the rear end also. The rear end makes a bigger difference than you'd think, GM vs. Ford, that is. Like you already stated, there are a lot of variables.
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