Cost: $0.99
Compatibility: iPhone

Car manufacturers often tend to fudge their figures on stated fuel economy. (Kia and Hyundai were recently forced to revise stated figures on all of their 2012 models.) Now, thanks to AccuFuel, you can track your fuel economy down to the last drop. The app will run you $0.99 but will also save you the embarrassment of realizing that your the truth about your Kia Sorento.