Puppy give me your method for testing speed of mower so its accurate, and will do it as soon as I get to a smoothish property. I did use the machine and cut for about 2 hours on a large park. It is definitely fast but cannot go full speed, due to undulations in terrain. The deck clanked even with flex forks. I love the mowers and they are far superior so far to my others, oh my 2005 is just a regular Hustler Z, not a super z.