If you are the driver who drives only few times a week you could qualify for cheaper car insurance. For example if you take your kids only to their activities or if you are a old person who drives rarely you could save yourself some extra money. Pay per mile is based on account and takes into account the miles you drive. Since risk occurs on mile by mile basis pay per mile insurance is the best way to pay for it. Your mileage will be tracked by GPS or regular odometer readings. Pay per mile insurance is the best for those who drive often but on the other hand your rates may increase depending on where you live and how much you drive. You might also have to pay for monitoring device that insurance company uses.