I just got done reading your post. I am new here and have been reading and learning. I too drive an Integra. Mine is a 1990 GS 5 speed. I've had the car for around 10 years and in the early years did the intake, header, exhaust mods. Other than that my car is stock. Before I started trying to improve my FE I would get 33mpg. Now, after doing some minor things to the car my last three tanks have yielded 38, 39, and 37mpg. I live in east Tennessee and don't have much flat road to travel. Most of my driving 90% is interstate. I believe once I adjust the nut behind the wheel I will break the 40mpg mark. Did you notice any difference by removing the rear seats? I've considered doing this, along with my passengers seat and spare tire. I may try it for a week and see what results I get. Have you considered a camshaft change? I know 90-91 cams are milder than 92+.
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