Just make sure whenever you renew your insurance, you are doing it at market value. Your insurance agent will always inflate the value a bit. Its up to you to check. Also remember that you need to take into account the overall resale value for 1 year of premium and not just at the month of renewal.

For example, when u renew your insurance in January your car value will be about 80,000. But towards end of the year your resale value has dropped to about 75,000. So when u renew in January dont take your renewal coverage at 80,000. Just put it at 77,000. Always try and get a median but nearer to the resale value at the end of the renewal cycle.