Most people have probably heard about Hyundai getting caught recently exaggerating its EPA mileage estimates and many/most manufacturers may take some liberties with those figures, too, since they are not based on an uniform, real-world driving test. Car magazine reviews are not reliable measures of a car's true mileage, either, as the writers tend to be jaded speed freaks who gun the engines like teenage boys most of the time instead of driving normally, trying to replicate their thrills when they get to test a 911 or M3. So, that leaves an owner consensus from a forum like this one as perhaps one of the better and more reliable sources for finding out how fuel efficient a car actually is.
What kind of mileage are you getting from your 2.0l ILX? For me, the best test of the maximum mileage I can expect would be a highway trip of at least a few hours where I can set the cruise at 65 or 70mph and not have to run the AC or heat. About 80+% of my driving is on the highway, so I'm most concerned about highway mileage. Are you getting the EPA estimate of 35mpg on the highway? What's the best mileage you've obtained on a highway trip? How about purely for around-town driving?