If you've driven your car more than 30,000 miles, it's time to replace the spark plugs. Over time, spark plugs can become covered in carbon deposits, which makes them work harder and decreases your car's overall fuel efficiency. When your car misfires -- when the engine stops for a brief second and keeps on going -- it's a sure sign that your spark plugs need replacing. Misfires increase exhaust emissions, which can negatively impact your overall miles per gallon, too.

Many dog shampoos or washes are loaded with chemicals that can irritate their skin and cause even more problems. One way to avoid chemical shampoo cocktails is to make your own all-natural mix using Castile soap, baking soda and apple cider vinegar. In between washes, generously sprinkle baking soda all over your dog's dry fur, and massage it in. Brush through the hair to get out the baking soda. The alkalizing nature of baking soda won't irritate dogs' skin, and it will naturally keep their fur deodorized and smelling fresh.

The active ingredients in sunscreens need to be protected from harsh, hot and bright elements -- just like your skin. Avoid storing bottles of sunscreen in your car, golf bag or beach bag when not in use. Long-term exposure to heat and sun can turn sunscreen from a skin protector to a simple moisturizer in no time flat. Instead, when you're not having fun in the sun, keep it in the fridge. The cool, dark environment preserves the lotion, and the chilled SPF feels good on a warm, balmy day. And remember: Wear sunscreen even as temperatures drop. Your skin will thank you.