You can't compare them because the tests are pretty different. However if anyone wants to get an idea of how high the fuel economy can practically go, may I point you towards my detailed explanations a page or two ago?
It appears these ratings are with the 4.100 rear diff...which is extremely impressive IMO, as the test cycle is not constant speed. If you use a 3.727 then you should be in the 40s on the highway. Considering that it's scoring considerably lower than the Impreza however, I think it's reasonable to expect something like er, 23/31 EPA. I'm still disappointed about the 6th gear