The state you live in may impact who gets the martial car, depending on whether it's an equitable distribution state or a community property state. If you live in an equitable distribution state, the judge must divide the property in a manner that seems balanced and fair. This decision is based on many factors, including who drives the vehicle the most.
In a community property state, in general, marital assets and property are divided in half (unless the spouses decide and agree on another way to divide the property.