No. The ecolobuses in Quebec City are very small and very limited. You are familiar with them. I believe their maximum speed is 33 km/h. That is tough on the hills.
In fact, the midibuses are as wide as normal buses. They are bigger than the ecolobuses. I believe those buses can reach a maximum of 120 km/h. They can travel 120 km in a day and are also equipped with air conditioning. The midibuses are really used for public transit and can transport a lot more people than the buses of the small tourist line you have in Quebec City. They are bigger.