Car insurance based on mileage, at least in part, makes sense. The more you’re behind the wheel, the more chance there is of being in an auto accident. However, it’s only one of the common rating factors car insurance companies look at. Annual mileage has little to no impact on car insurance rates – unless, of course, if you live in California. In the US, drivers can save about 6% if they reduce their driving from 15,000 miles per year to less than 7,500 miles per year. Californians, however, would save 32%, or more than $550, for halving their mileage. (The average American drives about 13,000 miles per year.)