Rising gas prices have been in the news the past couple of years, as it seems the price of gas will never fall back down to what it used to be. The last time I filled up my tank, it cost me around $50 (on empty) and regardless of the fuel efficiency of my car, I know I am not the only person who is frustrated by how much money we are spending on personal transportation. According to a new report, the Union of Concerned Scientists (UCS), explain exactly what our gas dollars actually goes to.