I've been reading about people using the PAS 5 and trying to get up to 28mph, once unlocked. Some think you have to be in top gear and pedal like a crazy person. you don't. It's a cadence sensor, so as long as you are pedaling steadily, even slowly, the motor kicks in. I've been on level ground, pedaling slowly and steadily, and go thru PAS 1-5, and it just goes faster and faster and faster, I don't pedal any faster at all. Yeah, it feels weird, to be pedaling and because of your speed and the gearing, your pedaling isn't really doing anything, it's not turning the rear wheel any faster, but as long as you pedal slow and steady, the motor kicks in and it takes off.
You don't have to pedal like crazy, like a regular bike, to go faster, the motor does that. You can go through PAS 1-5, pedal slow and steady and you will go faster and faster. I'm sure it looks weird to someone seeing you, since your speed and your pedaling do not match. You are pedaling nice and slow and steady and your bike is going 28 mph!