怎么和保险公司negotiate理赔数额? 请保留一会儿!多谢!!

My car is involved with an accident. The insurance company appraised the car and told me the car is total loss. The value they gave me is much less than what I got from the dealer where I bought the car. Really need some advices/tips on how to negotiate with the insurance comany on the value of the car.

Many thanks in advance.