I know I can't count the gain from miniskirts directly but I've decided to do that anyway
And FE was better by 3.5% (best FE without miniskirts vs last tank). Of course I should do at least coast down test or full A-B-A test, but that's not so important for me. And to be honest the extra attention from drivers passing me was a very funny experience. So now I need to build full skirts for rear wheels, painted to match Berta's color.