What is the average insurance for 4-cylinder car for a 21 year old?

Hi, Insurancecompanies each have their own formulas for rating. They typically use age, credit score, car type, zip code of garaging and other variables to determine how to rate a policy. The underwriting factors along with the insurance limits you are requesting will create the premium or amount you will pay. So.. to make a long story short not enough information. I would recommend however, shopping through an independent agent they represent more then one company and can provide choices and council on coverages.