It probably has to do with the discount code you're using. Some discount codes don't include any mileage whereas others have unlimited mileage. If you need help finding an unlimited mileage rate, feel free to put in a request via AutoSlash and then PM us the inquiry number from the bottom of the quote email and we'd be happy to take a look.

Keep in mind that often the 0 mileage rate is far below the unlimited mileage rate. As for which makes more sense really depends on how much driving you plan on doing.