I finally got a chance to do some gps speed testing with my pede. My vehicle setup was:

Feigao 540 12s
Mtroniks Truck controller
12 IB 3800 cells
87/18 gearing
Masher 2000 tires

My top speed was 47.1 mph. I may have been able to get a few more mph if I had more room. I may stop by my LHS and pick up a bigger pinion just to see how much more speed I can get. A 22t pinion should get me to 60 mph, if the motor can pull that gearing.