When driving, if you feel your car pulling to one side of the road or your steering wheel feels "off" or vibrates, you likely have tire alignment issues. Not only can having poor alignment be a safety issue, it also forces your car to work harder and wastes gas. If you sense your car's tires need to be realigned, get them checked and serviced. Getting this issue fixed can help you save around 10 percent on fuel costs (or about 20 to 30 cents a gallon). Goodyear Auto Centers offer free alignment checks; all you have to do is make an appointment on the company's website.

If you're a frequent flier, one of the easiest ways to cut down on one small wasteful act is to opt for a mobile boarding pass instead of a printed one. Over 1.5 billion boarding passes are issued every year, which adds up to a significant amount of paper (often coated with the chemical BPA) being used and almost immediately thrown away. Airlines are making it easy: Apps for your smartphone let you download passes, save them and do a whole host of other things to make your flight manageable.

One of the easiest ways to give your old toilet a water-efficient upgrade is to divert the amount of water the tank holds and uses per flush. An old trick (that you should not do) was placing a brick in the tank; it filled up space and forced the toilet to flush with less water. The problem with using a brick is that it's made from baked clay; over time, water breaks down the brick, and particles and other sediment clog the plumbing. If you can't replace your old toilet with a new water-efficient one, fill a plastic tub with pebbles and seal it with a tight-fitting lid. Then place it inside the tank. You'll save around 2 to 3 gallons of water with each flush.