To save a gallon of gas, you probably need to cut about 22 miles of driving from your week. Here are 10 of the easiest ways to save:

1. Use public transit. Or carpool. Leaving the car at home and sharing your commute with others can help you reach your gallon-goal quickly.

2. Slow down. The faster you drive, the more gas you use. If your average commute includes 20 miles of highway time and you drive it at 60 mph instead of 70 mph, you'll save approximately 1.3 gallons of gas in a five-day work week.

3. Combine errands. Need to pick up a prescription, mail a package and go to the bank? Instead of spreading these tasks out over a few trips, do them all at once. Park in a central spot and walk from place to place.

4. Shop online. Save the trips to the store, and consider other online services to minimize errands such as banking, buying stamps and paying bills.

5. Drive the small car. If you own vehicles of differing size, take the smaller, more fuel-efficient one on any long trips you can.

6. Take a hike (or ride a bike). Instead of driving everywhere, lace up your sneakers and get some exercise while you save gas. A bicycle can help you rack up car-free miles even faster.

7. Work from home. If you have a job for which working from home is possible, ask the boss if you can pick one day when you and your coworkers can telecommute to save gas. If you are the boss, make it a company-wide initiative.

8. Have a dinner party. Instead of your usual dinner-and-a-movie Saturday night out, invite your neighbors over for a small dinner party. You'll save the miles to the theater and restaurant-not to mention meal and movie money.

9. Share school rides. Instead of picking up your kids from school every day, ask a neighbor with kids in the same school to help. You can each take turns picking up the tykes.

10. Keep the trunk light. The heavier the load your car has to carry, the more gas it guzzles. Don't use your trunk for long-term storage.