
Quoting
flyingron
Whether there is a gap or not depends on how big your down payment is. Whether you need the insurance or not (and this applies to many insurance situations) is whether the situation that you are insuring for is something that you couldn't handle without it if it occurred. For example, if you've 100% financed the car and the payments are already at the limits of your affordability, gap insurance is probably essential. If the gap is negligiable or you have enough savings reserve, perhaps you can save the premium money.
You might also check with your lender. Many credit unions (and in fact, the even my auto insurer who offers financing as well), will include "gap coverage" at no additional cost in the loan (essentially, they just waive the difference).