Just get some smooth tread tires that will be better for pavement travel.

2.2 miles takes about 40 minutes to walk.

On a bike and mostly flat terrain, 10-15 minutes max.

Unless the commute is a steeply graded 2.2 mile slope the motor seems overkill and providing little if any benefit to travel time or enjoyment. Wouldn't you rather get to work with a little endorphin rush?

Maybe ride the route first after work or on a weekend to show yourself you can do it. But after a commute or two you will quickly see it's nothing and likely want to ride even further.