A new state-by-state study unveils the impact of mileage on the cost of your auto insurance.

According to new data from insurancequotes, an auto policy holder who drives 15-thousand miles a year pays a national average of 8.61 percent more for car insurance than an insured driver who drives five-thousand miles.

And rate increases related to mileage vary state by state.

States with the highest rate increases for driving 15-thousand miles compared to five-thousand per year are: California, Alaska, Washington D.C., Alabama and Massachusetts.

North Carolina is the only state where drivers don't see any rate changes when annual mileage increases.