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I DD my stock KA24DE everyday going through the same exact route to work. I've noticed that when work stresses me out in the afternoon I get substantially lower gas milage because I tend to drive a bit harder. Usually in the morning when I go to work at about 7:45 with similar traffic as when I'm going home at 3:30 I get much better mileage because I'm more relaxed. Any motor can get good mileage you just have to remeber that the street isn't a racetrack.
If you don't believe me try to do your normal drive for a week shifting at about 2700 to 3000 RPMs and you'll notice a significant change in fuel economy with only a slight decrease in acceleration. In all seriousness you almost never need to do above 3K in most drives anyways unless you need to accelerate really hard. IIRC, 3k in an SR/KA S13 is about 70 mph give or take a smidge.
I also have a friend who just bought an S13 with a turboed single cam KA and he said it get horrible gas mileage because of the tune, so a good tune changes gas mileage a lot. The same friend said when he used to have his SR he used to get great gas mileage because he never drove in boost if it wasn't necessary. IMO if I were going for fuel economy I would go SR because of the ease of the swap and when you're driving out of boost you're just driving a 2 liter four banger around.
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