Gas tank caps: They play an important part in your car's fuel system, even setting off a check engine light on the dashboard if they go missing or aren't screwed on correctly after refueling. Yet ...

Most of us grew up with gas caps. Getting your driver's license and learning how to pump gas is a rite of passage for many in the U.S. — and a big part of that is twisting off the gas cap or at least ...

On the scale of all the things that annoy you about car ownership, the actual act of refueling your car probably isn't high on the list, and twisting off the gas cap isn't on it at all. Well, except ...