i don't know how much you lost in an AWD. I think your figures for a FWD are realistic. Anyway, your estimations for a road car are very optimistic. I think we are closer to 20%, if not more.
Reagarding top speeds, keep in mind that these cars had different shapes and, most probably, very different aerodynamic drags. This actually can play a very important role in defining your top speed, much more than a 1-2% difference in your transmission efficiency, in my experience.
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