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I would bet that 28.5 MPG is about what an AT 1998 Civic EX is expected to get in the city? What kind of driving are you doing? Lots of stop/start city stuff or a combination of that with longer freeway trips?
How do you know the timing was close? Which mark on the crank pulley did you use for judging? And did you jump the ECU while setting it?
Have you done wet and dry compression tests? Checked for exhaust gasses and/or oil in the coolant? 190,000 miles is a lot of miles and you don't know that much about the vehicle history... leaking valves, rings, head gasket... all would sap power and undermine fuel economy.
I'll keep tabs with you and see if I can advise other stuff too.
Hey, you have the Honda factory service manual for the 1998 Civic? I do. I'll share if you want. Free, of course.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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