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http://stackoverflow.com/questions/14404066/changing-the-units-on-google-maps-from-metric-to-imperial

var source, destination;
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
google.maps.event.addDomListener(window, 'load', function () {
    new google.maps.places.SearchBox(document.getElementById('txtSource'));
    new google.maps.places.SearchBox(document.getElementById('txtDestination'));
    directionsDisplay = new google.maps.DirectionsRenderer({ 'draggable': true });
});

function GetRoute() {
    var mumbai = new google.maps.LatLng(18.9750, 72.8258);
    var mapOptions = {
        zoom: 7,
        center: mumbai
    };
    map = new google.maps.Map(document.getElementById('dvMap'), mapOptions);
    directionsDisplay.setMap(map);
    directionsDisplay.setPanel(document.getElementById('dvPanel'));

    //*********    DIRECTIONS AND ROUTE    **********************
    source = document.getElementById("txtSource").value;
    destination = document.getElementById("txtDestination").value;

    var request = {
        origin: source,
        destination: destination,
        travelMode: google.maps.TravelMode.DRIVING    // TRAVEL MODE
    };
    directionsService.route(request, function (response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });

    //*********DISTANCE AND DURATION**********************//
    var service = new google.maps.DistanceMatrixService();
    service.getDistanceMatrix({
        origins: [source],
        destinations: [destination],
        travelMode: google.maps.TravelMode.DRIVING,
        unitSystem: google.maps.UnitSystem.METRIC, // KM 
        unitSystem: google.maps.UnitSystem.IMPERIAL,   // MILES
        avoidHighways: false,
        avoidTolls: false
        
    }, function (response, status) {
        if (status == google.maps.DistanceMatrixStatus.OK && response.rows[0].elements[0].status != "ZERO_RESULTS") {
            var distance = response.rows[0].elements[0].distance.text;
            var duration = response.rows[0].elements[0].duration.text;
            var dvDistance = document.getElementById("dvDistance");
            console.log("distance: " + distance);
            dvDistance.innerHTML = "";
            dvDistance.innerHTML += "Distance: " + distance + "<br />";
            dvDistance.innerHTML += "Duration:" + duration;

        } else {
            alert("Unable to find the distance via road.");
        }
    });
}