Going from a '96 12V to a '98.5 1.8T both with similar mileage, my 1.8T averages about 2-3mpg better.
My 2.8 was stock minus the short ram intake.
My '98.5 has been modded, but I drive it pretty calmly around town. Personal best on the 1.8 is 32.66 highway only, while maintaining about 27 average(mixed) with going to school and what not.
I can't remember exactly what I got in the 2.8 on the highway, but 28 sounds about normal. Granted the longer gear ratios helped out as well.
I went from ~22mpg avg in my Camaro to ~24 avg/mixed in the 2.8, then ~27 avg/mixed in the 1.8T
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