Most drivers find a policy, pay the premium, and never think about it again. Big mistake! Checkbook shoppers find huge price differences from company to company. Most drivers will save $500 to $1,000 a year by shopping around and switching if they find a better deal.

In this episode: Which insurance companies have the best prices? Which ones provide the best customer service? Do price comparison websites work? Plus, why do many insurance companies use credit scores to set their rates?

Read Checkbook's full report on auto insurance.