Retuning is possible but really not the solution. Your traffic is what is the problem. 20km in 2 hours is horrific. That is a massive amount of idling which is a huge waste of fuel. If you have the air conditioning going, its going to make it that much worse.

The best thing you could do is find an alternate route that doesn't take as long. Even if it makes you travel more than 20km, it is likely be worth it. The other alternative would be to try to change your work hours or go in early to avoid traffic.