Shopping for auto insurance can save tons of money, but people aren’t likely to do it because it’s boring and tedious. Consumer CheckBook, a consumer magazine and group, shopped for auto insurance for various demographics in different areas of the country. On average, the most expensive driver cost 400 percent more than the cheapest driver. How could the price differences for the same exact coverage be so extreme? There are a few reasons. People don’t shop around, so insurers know they can jack up the prices and you’ll never check. Another reason is that insurers take different factors more seriously than others do. Credit score, for instance, may be huge with one insurer and not a factor at all with another. So, please shop around. Geiko and Progressive have been pushing people to compare, and they have steadily taken marketshare. Calling an independent agent can also check rates for you. But always start by checking the three best companies: Amica Mutual, USAA and Cincinnati Insurance. You may qualify for one of them. Even if you have to pay a little more, stick with one of these three. It’s worth it. After that, compare everyone else.