gistfile1.html

<link rel="import" href="../../lib/core-ajax/core-ajax.html">

<polymer-element name="cxz-vehicle-menu" noscript>
    <template>
        <core-ajax auto url="{{url}}" handleAs="json" on-core-response="{{ajaxResponse}}"></core-ajax>
        <h2>Vehicles</h2>
            <template repeat="{{v in vehicles}}">
                <li>{{v.year}} {{v.make}} {{v.model}}</li>
            </template>
    </template>
    <script>
        Polymer({
            ajaxResponse: function(event, response) {
                console.log(response);
                this.response = response;
                this.vehicles = response.response.vehicles;
            },
            things: [1, 2, 3],
            url: '/service/get_vehicles?access_token=x234765734ssf343432t'
        });
    </script>
</polymer-element>