pp - If you got yourself out on the open road and did not have to deal with traffic and lights you'd discover that without having to slow / stop / accelerate constantly your performance would be much better.
If I can spend a week commuting and have a 20kmh average on the odometer I figure that is good and when I am commuting 100km a day or doing longer rides of as much as 165 kmh my average speed over those distances picks up to 25-27kmh.
This is a comparison based on using the same bike with similar setups... my P20 folder.
If I did the same thing with my road bike my commuting speed would not change much but on the open road the Cooper idles at 30kmh as it is a much faster (efficient) bike and has taller gearing I can exploit when conditions allow.
This bike could make me lazy as riding it is so effortless and it does not take much to make it fly... I often ride it after I have done longer tours as it is a great recovery bike where, even at a restful pace, it will still fly.