16 is low, 18 is normal for (agressive) city driving, 22 is normal for city road types driving in a grndma style, or agressive mixed road types. The rated 28 comes only at a steady 60 on the interstate with no wind (actually you can close 33 in some occasions).
If the injector thing doesn't cut it (you may also try to run a bottle of techtron, it works well), have your MAF and O2 sensor checked.
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