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All I know is I had my Banshee topped out going across a stretch of desert that was graded flat. Going so fast my helmet was starting to lift off and it was howling. Since I ride my ninja almost every day I say I was going at least 80
I did 63mph on my (at that time) totally stock 98 Warrior on a level gravel road at the 4000' elevation. I was holding an Eagle Explorer GPS which is accurate to + or - 2mph at 600mph. I have ridden a friends Banshee which felt a whole lot faster.
I was clocked at a gravel road on my buddies 2000 stock Banshee at 79 MPH, let me tell ya that is F***in fast. Especially on a quad with only 3 pounds of pressure in each tire.