Joining a car pool has benefits beyond helping the environment. If you carpool with three other people, with each driving one-week shifts, you can cut the miles you drive by up to 75 percent. And the less you drive, the more you save on car insurance.
"Most companies track mileage," says Art Scott, a retired insurance agent who worked for State Farm for 30 years. "Anything under 7,500 miles is considered the pleasure rate -- and that's the lowest. Up to about 13,000 miles is a medium rate, and anything over that is a higher rate."
The amount you save will vary depending on several factors, but J. Robert Hunter, insurance director for the Consumer Federation of America, says the difference could be as much as 25 percent.