The good news is that 9 mph on a Huffy is probably 12 or 15 mph on a top quality bike if you are putting in the same or less effort! One of my bikes is a lightweight touring bike and the other is a Big Dummy utility bike that easily tops out at least 75 lbs and then I add groceries, charcoal, dog food, etc. I would guess your Huffy is probably somewhere around 45 lbs or so.

My comfortable speed on my Dummy is 10 - 12 mph and due to the high weight, I can easily hit 22 mph or better on any kind of downhill.

Have fun and keep pedaling!