You are probably wondering why this little detail is so important in terms of saving money at the gas pumps. When properly fitted and used (no more leaving it on the gas pump), gas caps are incredibly fuel efficient. They eliminate fumes and gas evaporation from escaping the gas tank and polluting the air.
Not to mention that the car will actually use this evaporation if it is left where it belongs. Gas tank caps also help protect the fuel system of the vehicle. They stop damaging water, dirt, and other contaminants from getting into the precision systems that make up a car's vital performance.
To recap, pun intended, gas caps keep gas and evaporations where they belong, protect the sensitive fuel system, and help reduce environmental concerns. Now, don't you feel bad for not seeing how important gas caps were before?
If you discover that your car's gas cap needs to be replaced, even though it may be tempting, a piece of cork won't do the trick. Check in your car's owner manual for the correct sized cap. If that doesn't have the information you are looking for, search for the answer on the Internet with a site such as CarJunky.com or make a quick call to the local auto parts store should be beneficial in the quest to replace the missing gas cap.
Failing all of that, call the dealership. They will know exactly what model and size gas cap you need for your car and probably have it in stock or can order it.
Every little detail that can make the hit at the gas pumps a little less painful is something that should be pursued. While under appreciated and often forgotten, a properly fitted gas tank cap will make a substantial difference in maintaining fuel efficiency.
Check the gas cap fit the next time you fill up the tank. Do you hear the hiss? Did you put the gas cap back on? It doesn't take long to take care of this tiny detail.