I'm just at 13,000 miles. On all-highway trips, I get between 46 and 48 (hit 50 once!), city-only I get around 36 to 40, and low 40's mixed driving. My most miles from one tank was 720 miles (vented), as posted here:
http://techreport.com/forums/viewtopic.php?t=22187
One day I'm gonna take a...