There seems to be a law that if something goes into a car trunk, it must remain there indefinitely. As the months go by, the trunk starts looking less like a trunk and more like a storage closet. While your car's trunk may be a convenient place to store all those items that you are not sure where to put otherwise, that storage comes at a price. All those items resting in the trunk of your car add weight, and that added weight costs you money.
If you are the type of person that uses your car trunk as a storage area, make the time to go to your car and empty everything out of the trunk and back seat that doesn't need to be there. In addition to cleaning out the inside of your car, it's also a good time to take off the car rack if you have one. Car racks significantly reduce the aerodynamics of the car which lowers your overall gas mileage.
The more weight that you can shed from the car, the lighter and more fuel-efficient it will be. Emptying out your trunk should save you a minimum of $20 for the year and possibly much more. An added bonus to reducing the weight in your car is that your car's driving performance should also improve.
An added benefit of cleaning out your car is that you will likely find a lot of things that you thought were lost. Keeping it clean can also mean that important papers or other documents don't accidentally get lost in the mess. once your car is clean and organized, it should be much easier to keep it this way and save you both time and energy (on top of money) knowing where everything is.
getting your car and car trunk clean is a great first step in getting all the places in your life better organized and clean. Remember, it's a first baby step.