Thanks, shows up just fine. Dude, that sucks. Looking at the videos you've posted in the past, I think we can rule out a few things. There are two lights on the grill, but I'm sure the effect on the overall aerodynamics is minimal at best (heck, I've added window vents, and they're in need of a redo, but they don't seem to interfere). The extra lights mounted elsewhere add a small amount of weight, but again probably negligible. Any extra equipment (junk in the trunk)? Unless you're toting an anvil around, I think we can rule that factor out as well (I'm allegedly 30 lbs. overweight

and still get better mileage).
How about driving habits? Jackrabbit starts can use 10 per cent more fuel than smooth accelerating. I think you mentioned that's not your driving style, so we can discount that. And I'm certain your tires are properly inflated, so that's out too. BTW, do you spend any amount of time with the engine just idling? When you first fire her up, do you let it warm up for one, three, or five minutes? Food for thought, say you let your car warm up for three minutes before going to work, then another three minutes when your ready to leave. For a five day work week, that's a full half hour of idle time. Multiply that by four weeks, and your now at two hours of running your engine, but not going anywhere.
The only other significant variable is the fuel your using. But I'm still inclined to think there's something else amiss.