Car Insurance Costs
Most states have a law about recovering unearned premium from insurance providers. Meaning that if you cancel your policy after you've paid your premium, especially at a renewal, you should be able to collect a refund for any days you've paid for after the policy is canceled.
While your old insurance card will show your most recent policy term, a letter of experience will provide your new insurance company with additional details from your old policy. This is usually because your new company is providing a hefty discount for the fact that you were maintaining insurance coverage prior to the start of your new policy.
If you have an existing insurance policy and are buying a new car, all you need to do is contact your current carrier and swap your old vehicle for the new one. This is a fairly normal process for insurance companies since people buy new vehicles all the time.