![Energy losses from internal combustion car [Source: DOE]](https://images.hgmsites.net/tmb/energy-losses-from-internal-combustion-car-source-doe_100668129_t.gif)
Conventional cars manage better fuel economy every year. According to the latest Department of Energy "Fact of the Week," though, their efficiency ranges from a-little-better-than-before to still-abysmal. This week, the DOE noted that of all the energy splashed into a conventional car's gas tank, only 12 to 30 percent actually goes to move the car...