9-10 local (ac), 14-15 highway(ac) . This thing sucks fuel in the city, but REALLY loves the highway :P. You can even average 17+ driving around 80-90, with the torque converter locked up full time, and the engine in stage 1 vtec mode (intake valves partially closed).
The 5th gear of the manual transmission is quite short, so it will consume more fuel on the highway.