It looks like the API determines the size of the y-axis item labels by
counting the number of characters in the label and not the actual
width of the font character. A workaround for this is to prefix the
longest label with more spaces.

code (notice 10 l's vs. 5 m's):

<html>
  <head>
    <script type="text/javascript" src="http://www.google.com/jsapi";></
script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["barchart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = new google.visualization.DataTable();
        data.addColumn('string');
        data.addColumn('number');
        data.addRows(2);
        data.setValue(0, 0, "llllllllll");
        data.setValue(1, 0, "mmmmm");
        data.setValue(0, 1, 28);
        data.setValue(1, 1, 15);
        var chart = new google.visualization.BarChart
(document.getElementById('chart_div'));
        chart.draw(data, {width: 350, height: 180, is3D: false,
legend: 'none'});
      }
    </script>
  </head>

  <body>
    <div id="chart_div"></div>
  </body>
</html>
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