Well I'm only going into the IMOW thats about 30-35MPH What I've run before is fun. I know a guy who has done 91MPH, his name is George Herrin.
You see, I like to be different sometimes.
I've always liked racing and I work on small engines a lot, so I just put them both together.
I'm also like you I'd like to have on of those 4X4 mowers. I also know a guy who has one of them too. If you ever decide to build one sign up to Heymow.com They are really good about helping people on their projects.