If you drive only locally, there’s no need to have a spare tire in your car, especially if you don’t know how to replace one. A spare tire weighs about 39 pounds, which reduces your car’s efficiency by 1 percent. That’s about an extra $50 a year in lost fuel savings. Instead, keep a can of Fix-A-Flat, which can temporarily inflate a flat tire so you can drive to a repair shop and get it fixed. When you do go on long-distance trips or travel, place the spare back in the car so you're prepared for wherever your travels may take you.