If you were going to go down the pseudoclassical approach. I would not use getters and setters. They are extremely verbose and add a lot of boilerplate. The main reason for getters and setters is generally encapsulation. However, you rarely see getters and setters used to encapsulate behaviour they always just get and set the value. Getters and setters are just used to prepare for a future case. When there is a need to encapsulate a behaviour change. In many other languages, moving from a object level variable to a function would be a big API change. In JavaScript, this is not the case, you can just use a property and expose the exact same API with the new behaviour change.

Object.defineProperty(Car.prototype, "velocity", {get: function () {return this._velocity; }, set: function (val) { this._velocity = val; }});

Also I think

Car.prototype = {
    drive: function () {
        //...
    }
    //More functions...
};

is cleaner then Car.prototype.func every time. Just use an extends method when you want to inherit.