Quoting batteredoldsupersport:
This was certainly the case with my 1.4k ss, my Dad drove it and thought it was underpowered. That's because he was changing up at 2500 rpm, and he won't rev any car beyond 4k for fear of breaking it. When we swapped seats and he felt the power output between 5k and 7k, he nearly fainted! My car though did have a huge flat spot at 2k rpm, and for normal sporty driving on country lanes something less focussed would have felt nicer.
😬 great story - changing up at 2,500...I don't think you should ever normally drop below that!? (except for towns, horses, cyclists etc!)