You may need to enable geodesic measurement calculations- 
http://dev.openlayers.org/docs/files/OpenLayers/Control/Measure-js.html#OpenLayers.Control.Measure.geodesic
http://dev.openlayers.org/docs/files/OpenLayers/Control/Measure-js.html#OpenLayers.Control.Measure.geodesic
.

Try adding this bit of code and see if your measurements look more accurate:

OpenLayers.Control.Measure.prototype.geodesic = true;


-----
Bryan R. McBride, GISP
http://www.bryanmcbride.com bryanmcbride.com 
http://geoserving.net/ geoserving.net 
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