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My parents have a '94 Civic LX manual with 270k miles. With the AC on going 75MPH, my dad gets about 39MPG. The '97 DX manual I had (which was theirs before I had it) seemed to get a couple less MPG under the same conditions. I'm assuming the 1.5l vs 1.6l and being lighter/smaller are what gave the '94 the edge. The tranny ratios were close enough that I didn't notice any difference.
All '91-95s of the same trim should get the same mileage, same with the '96-00s. I'm not sure where you're getting that '98 on get worse mileage. Going off of the Fuelly records for each year (this is all trims together), all the years in a generation are pretty close, and the '91-95s get a couple more MPG than '96-00.
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