through the other driver’s insurance carrier. Most all use services that survey similar cars in area to evaluate values. Gotta be tough to argue against the value evaluation. I’d ask for the specific cars they found that helped them establish that value. For unique or rare cars, the variance would be greatest. Then I’d establish evidence that makes your car more valuable. Like additions or service work. But in the end, awful tough to fight against them. You’d spend more. Of course, it never hurts to continually tell them your neck/back hurts. Talk up an injury claim. That might motivate them to settle on the car value to get rid of you.