Crilex, I would forget 30 mph, as I saw the word "legal" in one of your posts, if you plan to abide by that. Per the class system, the fastest you can go w/o pedaling is a class II at 20 mph. The class III are not allowed to have throttles. To go 28 mph on a class III, the pedals have to be moving. And since most of those bikes use torque sensors to detect the pedal force, any baby footing on them will rapidly slow you down to what the bike thinks is appropriate for that level of force. That means you can forget many of the no-throttle mid motors, all nice bikes but they require pedals moving for the motor to be moving.

I feel 20 mph is a good speed for a low power electric bike. While most of my ebikes will max out at that speed because of their motor/controller, I'd rather that the guts of the bike limit my speed, not a governor.

If you want to be quasi-legal, the bikes imported from China by Juiced, Rad, Volt will have throttled motors with pedal assist, and they can cheat a little and surpass 20 ,mph. Very few bikes will do 60 miles with no pedaling w/o a pair of batteries.