Trading for a more fuel efficient vehicle may say gas but it probably will not save you any money. If you need to replace your ride then by all means replace it with a smarter choice but if gas savings are needed now, then the best way is "drive slower".
I guess these people got tired of everyone honking their horns because they were not driving like a BOH on the freeway. They were actually driving 55mph in a 60mph zone thru town. They had been in the slow lane and moved over so I could get on the interstate.
I grabbed on camera and took this picture thru my windshield. As I passed I did toot my horn (the electric one, not the loud air-horn) and gave then a "thumbs up".