I been looking into upgrading to a Scag 61" Turf Tiger or Wild Cat. Scag's website lists the productivity at 6 mph. I can do the math and figure out the maximum productivity, but can they operate at top speed? My next question is how does the Scag compare to the Grasshopper. My father-in-law is a grasshopper man, and I may look at a 227/61. I can't find anything on their website about productivity, and I was wondering how the two compared. If anyone has any input about another brand, feel free to post a reply. Thanks.