Mate, even if its a bit out, mine is well fast enough believe me! Thing is, the torque of the hydros and the ample power make it virtually unstoppable. I do have to slow down if the grass is thick, wet and on slope but the deck can only get so much clippings out of it. I understand what your saying though.. If they say it goes "X" fast, then it should but IMO, that would be up to the dealer to sort out on pre delivery like checking the deck for level etc. I know your lawns are level and you keep it short so you may not see the benefit in this new machine but, put a couple hours on it and let me know what you think. Maybe ask dealer to bring out some G6 blades as well for comparison. You may miss the flex seat, I do!